Hello,
can you send me your settings, please?
You can upload it here:
http://4dsviewer.spirit-system.comIt is quite strange that it started with 2.1, since this version should actually make it much better.
Increasing Pirouette consistency can make it more noticeable, similarly as increased Rudder dynamic.
45-70° is really very, very bad - it looks like a rudder limit is very small to such side.
When you enable Subtrim (tuning), your tail servo arm must be at the center position, while tail blades closer to the boom so there is approx. 3-4° angle.
Rudder limits not more than 150 for each side - if they are higher, than you will need to put ball linkage further on the servo arm.
You can do a simple test, by downgrading to the previous version to make sure, that it is really caused by the firmware which I guess is only coincidence.
Usually when helicopter was not flying for longer time, mechanics can "freeze". But cleaning tail shaft can solve the problem.