Bloatware: Well I guess that's personal preference. Stuff I won't use is some LG stuff (home launcher, LG back up etc), live wallpapers, stock browser and video player, Google books, music, movies etc.
Tablet has no chance of 1 day battery life unless you aren't using it very much. It's not horrible though, I've had 3 hours constant use this morning and I'm at 50%. Screen is under 40% for night time use though.
Not sure if you need root to underclock. I always root every device so I've never checked. I guess theoretically you do not.
Sent from my LG-V500 using xda app-developers app