Assymetric roll in quad

New build quad. 130mm (shendrones shrieker). pixracer, stable px4. first time ‘diy’ quad - so first time tuning pids. setup like a tiny racer with smaller motors - still an agile handful!

got it flying - and manageable. BUT roll to left is slower rate than roll to right!! everything else seems fine in first indoor flights. yaw and pitch are symetrical. weight balance is fine, escs calibrated. NO significant drift in any axis.

Any ideas appreciated!