I had a similar problem a few years ago. It turned out to be my boots.
I ride 15/-15 with 25in stance. Had a pair of Celsius CLS and had the same pain you're experiencing in both legs. I played with the angles and stance width, which did help, but only a little. I ended up picking up a pair of vans and it went away within a few days. Not saying it's def the boots for you, but that was the problem in my experience.