If either of you are jb4 users, try reducing the lag fix. Seems to have eased the over boost symptoms.
I dont get a rattle but can feel the slop in the arm which is concerning me!
Car: 2010 Jaguar XFR (Cat-back exhaust)
Gone but not forgotten: Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)