I transitioned mostly to PLO around 2009. I still play NLHE, but PLO was more fun and interesting.
I've always been pretty weak at the stud games compared to the big bet games, limit holdem, or o8. It was tough to learn a lot of the games because they aren't available anywhere outside of big games in casinos, huge games online, or the occasional tournament. Hard to learn what you can rarely play. What stakes are you playing and do you mostly play them in tournaments or just in cash? WCOOP/SCOOP are good opportunities to get some practice in, but wish something like a 10/20 razz game ran frequently instead of having to play too small or too big for my liking while learning.
Limit games to me are always in cashgames. They just aren't made to play in a tournament form to me, atleast not unless you have very long blind levels.
I usually actually play micro stakes these days, 0,10$-0,20$ razz. or Omaha hi-lo, but there is fairly little traffic at those stakes.