Help from a th350 owners please.

[PbFut]

I am seeing bubbles in the tranny fluid whan it is on the warmer side of operating temperature. I am thinking the added capacity of my system, deep pan and cooler may be expanding to point of overfill but I do not know automatic transmissions very will. Will a overfill induce air into the fluid like a crank does in an oil pan?
The stick shows over fill when this hot, about 210 in pan but don't know if the bubbles are expanding the total volume. In any event I would think bubbles are not good.