Olympic B737-284 attitude problem

I have the Olympic Boeing 737-284 from pg 11 of FS9 Civil Jets and when I get to a cruising altitude above about 26,000 feet on autopilot
the nose of the aircraft begins to bounce up and down. Also, the elevator trim wheel is way too touchy. I installed a new panel hoping that would take care of it but alas-no difference. It doesn't bother me much, but my passengers are puking all over the cabin upholstrey. Is there an adjustment I can make in the aircraft.cfg file to smooth out this problem?
the nose of the aircraft begins to bounce up and down. Also, the elevator trim wheel is way too touchy. I installed a new panel hoping that would take care of it but alas-no difference. It doesn't bother me much, but my passengers are puking all over the cabin upholstrey. Is there an adjustment I can make in the aircraft.cfg file to smooth out this problem?
