My first thought was the finger nails a well. Subconsciously you know the fingernails need clearance. If you reduce the need to worry about the nails, you should be able to use more parts of the finger tip.
The thumb position should be dynamic. For some techniques the thumb tip should anchor on the back of the neck. For others a wrap around may be called for, especially if your using that thumb to fret the e string. You need to experiment to figure out where your thumb needs to be, a each players hands are different.
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