I may be one of the lucky ones that can wear Grados' for over ten hours straight without problem!! I have fairly small ears and find Sennheiser HD414 pads quarter modded and reversed fit me to a T. My ears just snuggle right on in there and get right at home. If you still have the bowls on your SR-125s, you may want to look into a bit of pad rolling. The results vary from individual to individual for comfort, and the performance varies as well depending on the type of system being used, but some folks report having good luck.

....uh, that would be ME!
Rich.