I'm running a DJI S900 on Pixhawk running the latest stable version with a frsky taranis. This morning I replaced the motor rubber dampening pads with DJI Part 35 which is a softer damper that is supposed to reduce vibration / micro bounces in the video. I had 3 successful flights and two near flyaway instances where full opposite input was insufficient to correct the drift while in loiter. Light Winds maybe 10mph at the time.
I had two instances today where the copter in loiter began to drift primarily in the forward pitch direction where full opposite rc input would not override/correct the issue. In log 15-05-01-58-01 I was able to switch to stabilize and with full aft input on pitch was able to land successfully. Full input seemed to hold position rather than command a normal response in the intended direction
In log 15-05-01-21-00 I quickly switched to stabilize but do to height AGL impacted the ground prior to full recovery.
I've attached a log from 15-04-27 as well which was prior to the change in motor damper rubber. From my eyes it looks like the vibration has decreased. I was assuming some bad vibrations where causing a severe drift in IMU but that doesn't seem to be the case. It doesn't appear the GPS wanders either.
Any help to better understand will be greatly appreciated.