I am more curious about the mounting arrangements for the pixhawk and where its mounted in relation to and how far the separation from power wiring , by same token whose gps/external mag arrangement used? 3DR? some other brand?
if 3.1.5 then only one of the mags used(not sure which)?
if 3.20-rc? then BOTH mags are used and aligned graphically…
almost sounds like the oscillation is a form of toilet-bowling 
and yes logs will help greatly…
hzl
I am planning on building/buying the same size rig so my interest is NOT academic…