I've been playing with my right thumb anchored on top of the pickup or the E (or B) string for the last 25 years with my wrist cocked at a fairly sharp angle. I use my third and fourth fingers to mute the A and D strings when I'm on the G. The small body and rear pickup on the SUB SB4 I got about a month ago has been exacerbating problems that have built up over the years; my right hand has been going numb while playing and there have been shooting pains in my wrist. I just discovered floating thumb technique and practiced with it for the first time tonight. It looks like the solution to my quandary. I just have to keep telling myself - don't .. collapse ... the ... wrist.