Did you work max hammers all 3 turns you whipped?
I adjusted the worked tiles a bit to favour the mines, yes, but not sure if it was optimized til the last possible hammer. Probably not.
Due to relatively few hammers in the capital, I would have preferred to mine all the hills. I understand you wanted those financial windmills, but I think more hammers there is more valuable at this point than a little more commerce from hills/windmills that you probably don't work most of the time anyway. With mines there, you have the option to squeeze out more hammers when you need it.
Yes, looking back, I would have prefered to mine more hills probably as well. There even was actually one mine on a hill where a windmill is now. But the mine has been destroyed by a hostile spy and then I decided to build a windmill instead because the capital was already quite large and I thought, now it's the time for max bureau commerce. I didn't expect that we'll do such a slave massacre in the capital. I even have whipped the Jewish temple now as the 4th whip as Seraiel suggested. Wow, 4 whips in a row in the capital, 8 citizens killed, 36 turns whip anger - that's against everything what I have been teached in my earlier games...

But the capital will regrow fast with both corn tiles and happiness is no problem. I guess, Oxford is worth this exception from the rule.
Did you really whip all three buildings at (close to) max overflow?
I checked that carefully and I'm relatively sure it was at least close to max.
Edit: I see there is a forest you could have chopped too, but I guess it would have gone to a different city?
I had seen this forest as well and chopped it now. And it went indeed into the capital and contributed to Oxford (with 24 hammers) and reduced the turns to 4 til Oxford is finished (and that was even before temple whip). So, in the end, it's not perfect but quite OK, I think.
If someone wants to try and perhaps optimize the Oxford-Superwhip I have attached a save from the turn (1150 AD) when the first whip should happen:
- University is already in queue in Nidaros for the 1st whip
- 1160 AD: Add Grocer to queue in Nidaros and whip, and whip the universities in Bjorgvin and in Uruk
- 1170 AD: Add Market to queue in Nidaros and whip
- Let the last missing university finish normally without whip in Monty's Grave. It completes just in time.
- Ignore the university in Uppsala. It's basically the 7th university.
- 1180 AD: Put Oxford into queue in Nidaros to see the remaining turns until completion