I gained 10 yards per club with a proper shaft fitting. Shocked to hear yours went down.
Surprised you are only carrying it 240ish with that type of distance on your irons. That's big boy long on the irons.
I was recently fitted for a new set of sticks, went with the new TaylorMade Speed Blades. They are SWEET. I'm a club and a half longer. Love them. I echo what LK says in that a proper fitting should gain you some yards.
Have the whole set and things are going pretty well.
Irons I gained about 5 yards in distance (9: 150, 8:165, 7:175, etc.) and have eliminated any slice. Unfortunately, I'm actually pulling everything a little now. Ball is going dead straight, just pulling it left about a half a green on 6 and 7 irons. Doing it consistently, too.
Driver has seen the greatest improvement. Be it the new driver or the change in swing, I'm now hitting it around 270-280. Misses are pushing it a little right, but hit all but 2 fairways with it yesterday.
Also, started using a 3x3 wedge system with my 50, 52 and 56 that gives me the following distances that are very easily repeatable: 45, 55, 60, 65, 75, 85, 90, 105, and 115. The same 3 types of easily repeatable shots with those 3 clubs can give me just about any distance from 45-115. The 90-105 gap is the most dangerous, but I can live with that being my one dead zone.