Pyroblaster

Hi All So after my first installation of the 737-600 I set everything up and had a first successful flight. The problem now is that every time I fire up the aircraft to do a flight, the nosewheel becomes unresponsive to my rudder pedals or has a mind of its own. I checked on the Hardware configuration on the tablet and the toe brakes and nose wheel were set to 'Symmetric' & 'Yaw' which is correct. I have spent the past 2 days trying to sort this out but with no success, the nosewheel either just sits there out of alignment or it will move around on its own without any input form me or the aircraft. Any help would be appreciated as I'm about ready to throw the towel in with this. Thanks in advance.