Have you done/considered any coaching, Guy? It can be a really big help (and most importantly, confidence boost) if you hook up with a good coach. I've worked with a couple, and they both really helped my game. There's a sticky with a link to the site in MSNL, or:
http://www.jvelliott.com/poker/coaches.php
RE. WPEX:
At 5/10 6m, the rakeback has worked out to be ~2.4-2.5BB/100 over ~20,000 hands. I don't have enough hands at 10/20 6m to really be sure; numbers show it's around 1.4-1.5BB/100, but it seems higher based on what I've gotten back. Though, that could be explained by the fact that I've been playing a fair amount of 2-4 handed at 10/20.
My results so far have been pretty terrible, but it's not because the games are so hard (at least at 5/10 and 10/20). While there are a handful of guys that I think are at least decent, for the most part, the player pool is terrible... including myself. Yes, the games are tougher than Stars, but they're not unbeatable.