I only capsized once on a jibe last year. Most were take downs just before the mark where I didn't get the chute down fast enough and the boat began to round up.
Some were due to angle of attack on the mark. We sail gates a lot and with an extreme angle to the gate, I wouldn't get as downwind as needed which hindered take downs as well.
One of the suggestions I picked up at GC was to pin the tiller between thigh and calf as I kneel to take down the spin.
This seems better than the foot method just because I want to be careful not to break the crossbar. However, the idea of tossing the tiller out the back is appealing.