I have found that in the summer we had in England (remember the course at Hoylake) i needed a very low bounce on all of my wedges. I went for a 4' bounce on my spin milled wedge and found it perfect for nipping the ball off the fairway. Now, the weather has returned to normal English weather and has rained all month nearly and as a result, i find my self catching a lot of my chip shots heavy because the club digs right in.
If you have firm fairways go for a lower bounce but if they get a bit wet, you will need a higher bounce. This is what I have found but this may just be me. Hope it helps!!!