Found out a couple of things:
If you're using old method on 5d3... I don't think it ever flipped zoom unless the table and mode map is defined.
Old method: Low FPS works... high FPS doesn't work so well, tends to flash or flip B.
New Method: Timer a works... timer B doesn't don't know how to find the mode map.. the one copied from 5d3 seems not to work. I found the table though.
EVF Method: works like it should. Sprinkles and all.
Would like to try the New Method with the table patching to see if it improves the artefact situation since zoom/mode flipping seems OK for me.