here the aircraft.cfg data
[WEIGHT_AND_BALANCE]
max_gross_weight=11089                         // (pounds)
empty_weight=4199                            // (pounds)
reference_datum_position=7.24, 0.0, 0.1         // (feet) distance from FlightSim Reference position: (1/4 chord, centerline, waterline)
empty_weight_CG_position=-1.2, 0, 0       // (feet) longitudinal, lateral, vertical distance from specified datum

[GeneralEngineData]
engine_type=0                                 //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
Engine.0=2.70, 0.0, 0.0                        //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar=0.932                          //Fuel flow scalar
min_throttle_limit=0.0                       //Minimum percent throttle.  Generally negative for turbine reverser
master_ignition_switch=1
[piston_engine]
power_scalar=1.0                              //Piston power scalar
cylinder_displacement=127                   //Cubic inches per cylinder
compression_ratio=6.0                       //Compression ratio
number_of_cylinders=12                       //Number of cylinders
number_of_magnetos=2                                                   / /Number of magnetos on the piston engine. Only values of 1 and 2 are supported.
max_rated_rpm=2300                             //Max rated RPM
max_rated_hp=480                               //Max rated HP
fuel_metering_type=1                           //0=Fuel Injected, 1=Gravity Carburetor, 2=Aerobatic Carburetor
cooling_type=1                                 //0=Cooling type Air, 1=Cooling type Liquid
normalized_starter_torque=0.3                  //Starter torque factor
turbocharged=0                                 //Is it turbocharged? 0=FALSE, 1=TRUE
max_design_mp=0                              //Max design manifold pressure, (inHg)
min_design_mp=0                              //Min design manifold pressure, (inHg)
critical_altitude=0                         //Altitude to which the turbocharger will provide max design manifold pressure (feet)
emergency_boost_type=0                         //0=None, 1=Water Injection, 2=Methanol/Water injection, 3=War Emergency Power
emergency_boost_mp_offset=0                    //Additional manifold pressure supplied by emergency boost
emergency_boost_gain_offset=0                  //Multiplier on manifold pressure due to emergency boost
fuel_air_auto_mixture=1                        //Automixture available? 0=FALSE, 1=TRUE
auto_ignition=0                                //Auto-Ignition available? 0=FALSE, 1=TRUE
max_rpm_mechanical_efficiency_scalar=1.0       //Scalar on maximum RPM mechanical efficiency
idle_rpm_mechanical_efficiency_scalar=1.0      //Scalar on idle RPM mechanical efficiency
max_rpm_friction_scalar=1.0                    //Scalar on maximum RPM friction
idle_rpm_friction_scalar=1.0                   //Scalar on idle RPM friction
[propeller]
thrust_scalar=1.0                              //Propeller thrust scalar
propeller_type=0                             //0=Constant Speed, 1=Fixed Pitch
propeller_diameter=12.0                         //Propeller Diameter, (feet)
propeller_blades=2                             //Number of propeller blades
propeller_moi=22.000                           //Propeller moment of inertia
beta_max=0.0                                  //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min=0.0                                  //Minimum blade pitch angle for constant speed prop, (degrees)
min_gov_rpm=1000.                                 //Miminum governed RPM
prop_tc=0.01                                    //Prop time-constant
gear_reduction_ratio=1.0                       //Propeller gear reduction ratio
fixed_pitch_beta=19                             //Fixed pitch angle of fixed pitch prop, (degrees)
low_speed_theory_limit=80.0                      //Speed at which low speed theory becomes blended in (feet/second)
prop_sync_available=0                          //Prop synchronization available? 0=FALSE, 1=TRUE
prop_deice_available=0                         //Prop de-icing available? 0=FALSE, 1=TRUE
prop_feathering_available=0
prop_auto_feathering_available=0
beta_feather=0.000000
power_absorbed_cf=0.000000
defeathering_accumulators_available=0
prop_reverse_available=0                       //Prop reverse available?  0=FALSE, 1=TRUE
minimum_on_ground_beta=0                       //Miminum pitch angle on ground, (degrees)
minimum_reverse_beta=0                         //Minimum pitch angle in reverse, (degrees)
[contact_points]      
point.0=1,  0.46, -3.45, -6.75, 1200, 0, 1.29, 0.0, .400, 2.5, 1.0, 1.5, 1.5, 2.0, 0.0, 0.0   
point.1=1,  0.46,  3.45, -6.75, 1200, 0, 1.29, 0.0, .400, 2.5, 1.0, 1.5, 1.5, 3.0, 0.0, 0.0   
point.2=3, -21.63,  0.0, -1.51, 1200, 0, 1.0, 0.0, 0.400, 2.5, 0.595, 2.0, 2.0, 7.0, 0.0, 0.0
2.5, 0.65, 0.0, 0.0, 7, 0.0, 0.0
static_pitch=16.65
static_cg_height=4.10
gear_system_type=3
[brakes]
parking_brake=0       //Parking brake available
toe_brakes_scale=1.000000  //Brake scalar
parking_brake=0

Sorry old chap. I would help if I could. I know very little about FS flight dynamics. I don't know which aircraft you based this on so I tried your contact_points, static_pitch & static_cg_height entries in the FS9 default Piper Cub Aircraft.cfg. It works fine so I don't think that's the problem.

I did notice the parking_brake=0 entry is duplicated but I don't think that's it either.