I wuoldn't have handled it much different than you did. I'd grunt a few times once they were done and throw in some doe contact calls to entice them that you are a buck and you have a doe with you.

I sit patiently, call again and perhaps do light sparing with the antlers and again sit patiently. If you don't call them in at least you know they are there and you haven't spooked them. A good stalk might get you in but it might also bust them out of there as well.

In your case, perhaps they didn't hear you, had does around or just weren't interested in another fight without a doe present. Great hunt anyway.