Would also like to know other people's BB 3bet range vs BTN! I think I flat too much, but I tend to mix it up with hands like low suited aces, low suited kings, offsuit broadway like KTo, ATo and suited gappers like Q9s, J9s, 97s, 86s etc (around 40% 3bet, 60% flat). Also depend on the villain of course
I 3bet more from SB and tend to flat more from BB.