You're probably right. You're retraining muscles that are used to going one direction into another direction. That can be very painful until they adjust to it. Don't give it up, you'll eventually see a benefit from it.
I learned I was sitting too high at my desk and it was putting too much pressure on the back of my legs (even though they weren't dangling, my knees weren't bent enough) and that was leading to sciatic nerve problems. I lowered my chair 1 inch and I haven't had a problem since.
T19 M15 S19 XH47 M43 bomb12/4/07 PA5/07 S12/26/07 D final 11/17/08 Back together with no defined R 05/2010 confused....to say the least!!!