Braid, although stronger, is actually less abrasion resistant than mono. This has been proven, here is a little test I found on youtube
https://www.youtube.com/watch?v=C-SqIsZaE6s
I use 6 lb mainline for bass fishing also, though I only usually fish for smallies on the Umpqua. I don't think you need anything heavier than 8 lb mainline, most people use 10 - 12 lb. mailline for steelhead.