I lowered my seat just a tad, and then had to play around with the seat position itself, but ta-da - my legs are just generally sore all over after my ride today, instead of intensively sore hamstrings. Guess I'll be glad when they don't hurt at all after riding? I think I'll go back to the LBS and have them check the fit a bit now that I've put 130 km on her...

Thanks for the advice!