From looking at a bit of database analysis from another site at the weekend, players 4Bet plus range is really value heavy. I have got to the stage of only calling QQ+, AK. Might be too nitty but not worth the tilt when lose stack AQ vs AK etc. I started reading the Mental Game of Poker by Jared Tendler. Really not a self help book kind of person but finding it really useful to get a bit of perspective and pick up some tips about coping with tilt.