If they truly "pinch" the ears, they're not set right yet.
I wear mine with glasses, never have to take the glasses off, never have any problems. I will admit they take a moment to put on-- then I usually forget they're there for a good long while.
Recently I bought a set of KTXPro1s and found them very comparable to the KSCs, if not identical (an FR graph I found suggests they may actually be *better* than the KSCs by flatness standards). I don't know why these don't get as much attention as the KSCs-- probably because they are ugly as all get-out. But if you needed a headband instead of the clips, you could do a heck of a lot worse for the price.