Excuse what may be beating a dead horse. Should one let ones last three fingers float free or curl them in under the knuckles for better control? For years I played with fingers out, even using the pinky on the pickguard for an appoggiatura. It never worked well and created tension.
Now I've overhauled my technique, closing the fingers and letting the hand float above the strings...which has been frustratingly slow to improve but is improving. At this point I don't want to open the fingers again and return to bad old ways of the past and I like the solidity of the closed-hand approach.
Also: what is the optimal distance above the strings for the hand to float? I notice a subtle difference between distant and close positions in the metacarpal nerves/muscles used.