#1
well first of all, i had no idea where to put this, but picks and strings count as gear and accessories i guess so...

ive had pick slipping problems ever since i switched from 9 gauge strings to 11 gauge strings, would the added thickness to the strings be the cause for my picks to keep slipping from between my thumb and index finger?
#3
Pick droppage is usually the result of a very light grip. Hold that sucker a bit tighter. Try out a whole bunch of picks. I used to drop em all the time, then I started using .88s. Try as many as you can, youll find one that you like.

Problem solved....
1981 Gibson Les Paul Custom (Black Beauty)
1980 Marshall JMP 2204