All steel roundwounds are rough, if you want low action you'll need high tension strings, rotosound and fender are among the high end for tension.
I think you're looking for strings which doesn't exist - high tension for low action, and soft, smooth feel.
If you want rounds which have a soft, smooth feel you'll need nickel roundwound, but they are not as bright and clanky as steel roundwounds.
You may want to drop Newtone strings (I have no affiliation with them) a quick email, stating your requirements, won't cost you anything and you may get sound advice to get you close to what you want.