f you were going after eye candy, you can flash a custom rom. but as you probably know by now, you have to hardSPL unlock you phone first. but of course...no ROM is flawless...not even stock. so you just gotta pick the one that works best for you.
why wouldnt you be able to revert back to 6.1? all you need to do that is the sprint stock shipped 6.1 ROM found here
http://forum.ppcgeeks.com/showthread.php?t=91940