The way my group does it, it's a dance of heading into the stack if I have to get out of the big circles, then back out if I don't have a small circle. It's a little involved, but I have practice at it.

I probably wouldn't have to do that if we had a different plan for baiting the big circles (I've seen some groups stack a melee on MT, and I've seen some groups bait one directly underneath Bahamut--either of these can help make sure one of the sides other than the stack point remains safe).