Could also work on ball placement.  For me, I can get a lower ball flight by moving the ball a little back from middle for a little extra distance.

u might not even need to go as far as getting new irons cu u might find that the ball flight might become too low if u switch.if u like the feel of ur setup there are two options:u could hardstep ur irons a few cycles which will bring the flight down without changing the weight and feel.or u could put s400's which will bring the flight down but will be a little heavier.hope this helps.

Maybe try X100s. I hit the Rifle 5.5 and I'm not sure you would see to much difference with the 6.0. But then again you might be able to find the 6.0 and other shafts in the fitting cart at one of your local courses to check out.