Hi all.
When playing E7 my pinkie always sits close to the nut end of the 3rd fret on the B string, causing a bum note. If I try to
slide my pinkie closer to the 3rd fretwire where it should be, it drags my ring finger onto the second fretwire.

causing a different bum note.
Is this a common problem and how do I get rid of it? Will general fingerstretching exercises that include the pinkie eventually just let this happen, (haven't helped at all so far) or is there some other trick/principle to be learned?
Thanks
Ian