I'll wait until I finish(well, it should be a relative term, obviously) the swing change, if I were you. When you feel good about the change, when your body go through the swing automatically with minimal intervention from your head, pulling out the brand spanking new club fitted to your swing on your favorite course, not the range should be great.
I'm kind of your boat right now. Trying to stick to OPS, using more core muscle, whole body. I played 3 rouds and hit the range ball for 11 consecutive days in a row, first time in my 1 year golfing experience. Some reason, I have no problem with my back, or any other parts, but my fingers, especially my two pinkys. I don't know why but my left pinky is hurting more. Can understand my right pinky is hurting, since I use interlocking grip, my right pinky gets stressed quite a lot, but why left pinky.