SHimmy? Blade Tracking, Low headspeed, Belt tight -due to temp change.

Wagging? Low headspeed, If you flew 10 minutes your headspeed is probably too low. I can fly 8 minutes if I just fly scale. If I 3d, I get 6 minutes. BTW the better you get the shorter your flight times become, at least following the 80% use of pack rule.