Sorry to say this to such an experienced senior trader like you, but your posting above just proves that you don't know how RegT margin trading nowadays works, ie. in your times it seems to have been different than how it works nowadays.I'm really perplexed how OP could earn 60% in a week selling weekly options. There isn't enough premium and margin on reg-t would prevent you from getting size. Further those options haven't expired yet, so those earnings could largely come from theta - meaning OP is running like 3x that in short premium.
IB uses realtime/dynamic margin calculations. Don't ask me the details, I just make use of what is possible at IB; nothing more, nothing less.
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Margin requirements now might significantly differ from the ones 1 minute (or 1 day) from now.
