Project Airbus cruise problem

[The320Pilot]

I'm having an issue with PA models (FSX, v2.1). When I'm climbing and get to the cruise altitude, the aircraft keeps wobbling up and down for about 50 feet up and 50 feet down . When I hold altitude at lower levels, e.g. at FL190 or at holding patterns or whatever else, the AP keeps the aircraft at the set altitude without it behaving like a roller coaster.

Any ideas on what's happening?
Thanks.

[Ratinho]

Change in the Aircraft cfg file to read:

[flight_tuning]
elevator_effectiveness=1.0
pitch_stability=2.5 <---------------
roll_stability=1.5 <---------------
yaw_stability=1.5 <---------------
aileron_trim_effectiveness=0.9
rudder_trim_effectiveness=1.1
cruise_lift_scalar = 1.00

This change will stop the up and down in hight altitudes
Ratinho

[The320Pilot]

I'll try that and see how it works for me.
Thank you