rev up those droprates

I've heard mixed opinions on my buff to droprates, piggybacking on ergo's proposed buff (and subsequent nerf to rnd prices) but the opinion has mostly been 'not enough'. This is a tiny bit of an update and I'd like to hear your opinions since it's mostly value editing and really easily changed.

tl;dr: mining should be mining again and not monster hunter laggy 2d edition

(also diamond no longer spawns in the primary chunk of the east asteroid at all)