Once I start writing more regularly, is this a sane weekly split: 3 GS answers on weekdays (short ones) and 2 optional answers on Sunday? I work, so 5 mains answers a week already feels ambitious.

If you tried something leaner that you actually kept for a month, I'd like to copy the structure, not the hour-count of a full-time aspirant.

I do 2 GS + 1 optional in a week when work is heavy, and bump it only if the week is lighter. A plan I skip every Thursday isn't a plan. Quality of one reviewed answer beat four unreviewed ones for me.

Agree on review. I leave 20 minutes the next morning to mark my own answer against the demand of the question. Otherwise I'm just producing pages.

I'll start with 2 + 1 and a next-morning review. If that sticks for three weeks I can add more.