Ive flown the B2 for 8 yrs in utility work, namely fires and power line survey and never heard of these symptoms.
As Shawn has said check your servos and rigging. Id also check your accumulator pressure is at required values whilst your at it.
Another point, is your hyd pump supplying required pressure?.
Check your frictions are not binding also, i like to fly with a little friction on both controls but i always check they are full and free on control checks prior to applying a little friction.
I like others are interested in your outcome.
