Joe,
Depending on the clothing either a collar choke or maybe a cupped hand behind the neck or hair, and a shoken or hiraken drilling in to the front of the throat.
The bridging being done towards the outside of the shoulders with a powerful hand movement of some type to assist and toss the bad guy off.
The bridge during the choke might help as well.
I know we started from the top mount, my instructor just always says "the best way to get out of a hold, is not to get in the hold".

And from your fight films Joe, I haven't seen you top mounted either.

Fred