I'm in 4* gear, with all my resist sets and weapon types in place. T2 is now too easy, but T3 is just too punishing. I'm not saying T3 is too hard; I like the challenge. It's just not economically feasible to slog through a bunch of floors that are much, much harder but aren't at all rewarding in terms of either time or mist spent. I barely break even until the last couple floors of the tier, and by that time I may have already died a couple times.
So the smart thing to do is grind T2 until I can upgrade an armor set to 5* and then run the appropriate T3, but... I just can't bring myself to grind T2 any more. Maybe I should have focused on getting one set of gear to 5* before diversifying. Making alt gear was fun and it seemed like a good idea at the time. The new boss area is laggy and I don't need any of the token rewards. I'm sick to death of Jelly Palace. There's just nothing fun to do any more.
they are adding a new patch soon that may interest u
http://forums.spiralknights.com/en/node/17761