@pezzott1 Yes, it looks like there is a spring arm ‘hitch’ at +/- 90 world pitch where it seems the spring arm switches sides. I experimented with the EZDof plugin and quaternion rotation of the spring arm. It was about the same, so maybe it’s not gimbal lock… it is a head-scratcher 
Regarding measuring the axis difference caused by RInterp lag in each axis, I got it working! Get Control Rotation (instead of Get Actor Rotation ) returns Pitch up to +/- 180 degrees (instead of +/- 90 degrees). Though I’d prefer using vectors for the area in blue, so if someone has any suggestions?
