Another grab trick I've been trying is surrendering control of the grab first turn so you'll be the one with the free grab replay pending
playing with active grabs you can reset your center of gravity. replay1
you can also use the free arm to help you float over them. real world concept found here https://www.youtube.com/watch?v=1liU6ZxaziI replay2
float hand can be used to block turn overs. replay 3, 4
also i've heard of a left hand bias in grabs can anyone confirm this i haven't noticed it.