The worst I got was a couple of bad frames at the begining.. pink on 600D just like that is from CPU usage.. ie GD on, display filter on, etc.
This lowers CPU by like 10% so should help with that too. Yes, I kept the restriction on frame sizes.. easiest thing would be just to add some back and try it out. Anyone really want the couple of pixels?
In crop mode 1920x1040 kept going most of the time. The 1072 writes slower it seems.
And it does work on other cameras.. 6D got 41MB so 5d3 will probably cruise along at whatever its top speed is. I was actually hoping a1ex with his greater knowledge would find a nicer way to do this but there may be no nicer way, who knows. I can try flipping it on in LV, and see if it speeds up after a few records, then it can just be turned on/off with raw.