The undercarriage not fully withdrawing is built into the model, nothing you can do without the source file. However, these days the air file doesn't tell FS a whole lot. You can overwrite pretty much everything the aircraft.cfg file; engine specs, landing gear, size, shape, controls, airspeeds, flaps, etc. etc. If you are worried about it using default 350 stuff with perhaps only the gear rearranged so it sits right on the ground (does it?) then just open both it's and the KA350s aircraft.cfg files and compare random things. Gear locations, flaps settings, engine power and torque. etc. etc.

If the speeds seem good, flaps seem right, and all that it is correct more than likely. Most turboprops I have flown have somewhat of that performance-driven sports car feel.

This type of thing is the reason why FS gets a poor rating in the flight dynamics department compared to X-plane, developers that don't care about the flight dynamics to make proper ones. That is why I'm here  I make proper and realistic flight dynamics and I'll have some e-mailed to you in a few days if you'd like.

With all due respect chomp_rock, M$ FS has sod-all to do with aerodynamics and is ALL about faking it to look good.
Mike Stone, bless him, makes lovely, realistic, framerate-friendly aircraft and personally, I just love the extra work involved in making them appear to fly properly.   

Kev

Bazza,

The answer is quite simple; as Gnome said, Mike does a great job in making fps-friendly, realistic looking aircraft, often filling the niche that everybody seems to miss - as he will freely admit that he is no airfile expert, so he usually uses a stock MS airfile (in this case the King Air 350).  We have to make sure all those airfile experts have something to do!!!

AndyG