Btw, currently it seems unlikely that I will have time to do more sandboxing on whether we should whip the WB on T39 or not.
So, if you have time to check (or already know) what works best in our current situation: Great! If not: I will trust your judgement call anyways! The outline that you posted earlier is in any case and I'm hopeful that we manage to improve it e.g. so that our 2nd city will work three improved tiles at size 3.But nevertheless, unless you are in a hurry, let's not rush with ending the T39.
I would love to try your micro plan myself if I somehow manage to squeeze in my life a peaceful half an hour.