The nose wheel in one of my fixed gear planes is off the ground by a few inches when the plane is at rest on the ground.  Main gear contact with the ground is fine.  Been trying to fix it in the cfg and/or air files, but can't get it right.  I'm probably trying to adjust the wrong thing.  Any help?

In addition to what Katahu points out, another thing to consider is the static pitch value. 

This is the [contact.points] section of the C-182 and I've high lighted the static_pitch value.

       //0  Class
       //1  Longitudinal Position        (feet)
       //2  Lateral Position             (feet)
       //3  Vertical Position            (feet)
       //4  Impact Damage Threshold      (Feet Per Minute)
       //5  Brake Map                   (0=None, 1=Left, 2=Right)
       //6  Wheel Radius                (feet)
       //7  Steer Angle                         (degrees)
       //8  Static Compression           (feet)  (0 if rigid)
       //9  Max/Static Compression Ratio
       //10 Damping Ratio               (0=Undamped, 1=Critically Damped)
       //11 Extension Time              (seconds)
       //12 Retraction Time             (seconds)
       //13 Sound Type
[contact_points]
point.0 = 1,  0.48,  0.00, -3.58, 1500, 0, 0.5, 22.0, 0.3, 2.5, 0.7, 0.0, 0.0, 0
point.1 = 1, -5.02, -4.50, -3.33, 2500, 1, 0.5,  0.0, 0.3, 2.5, 0.7, 0.0, 0.0, 2
point.2 = 1, -5.02,  4.50, -3.33, 2500, 2, 0.5,  0.0, 0.3, 2.5, 0.7, 0.0, 0.0, 3
point.3 = 2,  -3.60, -17.9,  2.08, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 5, 0.0, 0.0
point.4 = 2,  -3.60,  17.9,  2.08, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 6, 0.0, 0.0
point.5 = 2, -19.93,   0.0,  0.83, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9, 0.0, 0.0
point.6 = 2,   1.40,   0.0, -1.33, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 4, 0.0, 0.0
point.7 = 2, -19.93,   0.0,  6.83, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 7, 0.0, 0.0
point.8 = 2,  -4.60,   0.0, -1.33, 1574.8, 0, 0.000,  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 8, 0.0, 0.0

max_number_of_points = 21

static_pitch=3.82               //degrees, pitch when at rest on the ground (+=Up, -=Dn)
static_cg_height=3.015          //feet, altitude of CG when at rest on the ground