I played graphite shafts for 8-12 months a few years ago while recovering from a rib injury. I'm a decent player -- low single digits -- and like to give it a belt, and I found the stock Ping graphite shafts not quite as reliable as steel on either distance or direction. I believe that this was in part because of the lighter weight and higher torque, but also because they were 1/4 or 1/2 inch longer than steel. I wonder if length is the issue with your graphite shafted set; it could make switching between them off-putting.
Anyway, as soon as my ribs allowed I went back to steel, with improved results, and have stayed there.
If you want to stick with graphite, it might be worth investing in some after-market graphite shafts which are generally heavier and have less torque than the stock models (KJ Choi plays a high quality, heavier graphite made by MCC). Alternatively, there are some good lightweight steel shafts around. A friend of mine who is a good player has just switched to the Nippon Steel shafts (95 or 105g, can't remember which) with great success.