Hi all, been a member for a while but this is my first post.  I have a question about 3 betting obvious fish at the table who flat call 3-bets in position and out and have shown down weak hands in these situation.  Should I tighten my 3bet range because they seem to be flatting far wider than expected or should I widen my range a bit to try and exploit their flatting range.  I can't stand losing valuable chips to guys flatting a 3bet with Q10o and refusing to fold on a dry flop or spiking the Q-ball on my AK.  Obviously I 3bet shove when stack sizes dictate but it is when stacks are deep that seems to be the problem. Suggestions? Thanks