Try RCBS case lube 2, and an RCBS case lube pad, it comes with nylon neckbrushes, that you can thouroughly lube the inside of the case neck.
Then properly adjust the spindles with 3/16" of the decapping pin protruding from bottom of die, dont overtighten the collet, Brian is right there's a certain point where that dude slips to keep from breaking the expander and decapping pin assembly.
Try to relax and have fun, you may be hurrying the process.