I don't get the "you made 77% on the initial margin req". Sure, you can't make 77% without leverage... But 77% is 77%...
I think vol was quite low for an extended period during 2017. VIX was even below 10 if I recall. I don't remember ATM vol though
Meaningless.
VIX cash bottomed at 11.03 in April.
It's moronic to calc a yield on the haircut. I truly hope you blow up.