I'm a stalwart of the Clubs... forum. What model irons do you have, and how are they shafted?
I have played Callaway X20 Tours for three seasons. I had tested them back in 2008, but was reluctant to play them because I was shedding stiff shafts. I got a set with PX 5.0 shafts, which turned out to be a whole lot stiffer than I was advised.
Fortunately, I got a demo X20 Tour 6i, and used it to test out different shaft options. I recently reshafted with NS Pro 8950GH (R.Flex), 18 grams and about a half-flex lighter than the PX shafts.
At the same time, I struck it lucky and got to test the SLDR irons, which are shafted in the KBS Tour C-Taper Light 90 shafts, which are a bit lighter than the NS Pros.
At any rate, I picked up a full club of distance with both the reshafted X20Ts and the SLDRs. I'm now getting into the low 90s, and my HDCP is finally dropping for the first time in two years.
A fellow SandTrapper, ClubRat, tried the SLDRs when he played with me a few weeks ago. He has experienced Mizuno MP irons, with a DG R300 shafts (about 125 grams). He hit SLDR back-up shots on several holes, and also averaged about a full club longer than with the DGs. (And, he was about 10 yards longer than I was).
So, you might take a look at your current shafting. You don't list what clubs/shafts you have, so I can't make any suggestions at this time. So, consider a tech check. Maybe either new irons, or a reshaft if you like your current ones. Unless you have a back problem or some hidden swing flaw, you don't want to mess with a swing that regularly breaks 90.
I'm in a dilemma. Both the SLDRs and the reshafted X20Ts are a pleasant change from last year. Not sure which one to play regularly.