Forum:Going back to Playthrough 1?

I've gotten rather tired of being in Playthrough 2, mostly cause at level 50, I'm still a bit out of my game from not playing for a few months. So I've been wondering, would there be any negative effects of going back to the first playthrough? Weapon loss, levels, ect.? I also kinda hope that will lower the level of enemies in the Underdome to make a bit easier for me until I can get back my trigger finger back.