Thinking of switching to a 12-13* driver........ thoughts?

I know, I know..... Go get fitted and let them tell me what loft I need. But my situation and thought behind swapping: I have major back and pelvic issues that are effecting my swing speed and ball flight with the driver significantly. 5 years ago, I was playing a 9* stiff shafted driver and hitting the ball nice and high and had a swing speed of 105mph and my handicap was around a 10. 2 years ago, I switched to a 10.5* driver with a mid/high launch shaft to recover some height in my drives after my swing speed slowed to 98mph. The swap maintained at least my ability to hit the ball 230-240 yards. My handicap slipped to a 15 though. Fast forward to now: I still have the same driver, same awesome shaft, but have started to hit the ball very low this year. Mainly because of my driving, my handicap has slipped to a 20 on the last recalculation. My great drives are dead straight/slight draw but never come more than 15ft off the ground, carry 190 yards, but roll out a long distance depending on how firm the fairways are. My launch angle on the monitor is around 7-8* with a 10.5*driver. Swing speed is around 94mph now. When I have a forced carry and try to force myself to hit the ball high, I get a huge slice, but I can force it to go high, although it does give me some pain in doing so, which I would assume is related to the motions I have to make to get the ball up in the air. My immediate reaction after this did not correct itself after a few months was to go get a few lessons. I was doing a few things fundamentally wrong, which helped the slice a bit, but when I put a great swing on the ball that doesn't hurt my back and doesn't slice, it's a low bullet. I can consistantly hit low bullets all day that go perfectly straight, but unfortunately, I'm just not getting any yardage out of them most of the time, especially when the fairways are soft. So I'm happy with my direction but not the angle. I have tried 2 different instructors to help me get the ball back up in the air off the tee, but it seems that using my current equipment and my back problems that it is impossible. footnotes: I need to be able to play pain free. I can hit a straight shot with good velocity off the tee. I cannot get the height I need in order to get a good carry. I am thinking of swapping to a 12 or 13 degree driver (buying a used one at first just to try) in order to get my launch angle up a bit. I'm not looking to hit 300 yard drives, I'm just looking to be able to hit driver instead of a 3 or 7 Wood for a forced carry. It seems that I can hit my driver only 10-15 yards further than my 7 Wood if the fairways are soft. The 7 Wood actually carries about the same distance, just no roll-out. Good idea? Thoughts?