It happened also to me to test some boards with noisy sensors.
I think we have two kind of problem:
- some cheap boards suffer from aforementioned electrical problems
- even with good boards with good PSU the default parameter values for PID are not good for this little copter
For the second part you (@wicked1), @andyp1per and others are doing a very useful job explaining which parameters need to be changed and in which way.
Thanks
P.S.: in all discussions you always talk about INS_GYRO_FILTER but never about INS_ACCEL_FILTER, do you think could be useful to experiment also with this last parameter?