I own the 33 with 26 inner and installed a Michelin Power Cup 30mm which came up 34mm and a Vittoria Corsa Pro 30mm which came up 32mm.
The Michelin is wider with a rounder shape, the Vittoria mire pointy in the middle, bot sure which ones I will ride.
My friend measured a conti gp5000 30C at 32mm on that 33 wide rim. Which is why i chose 30C on 33 rim, in fact, for the rule of 105. For a heavy rider, aka, me, at the back i'd put 32C though. The 3 friends i ordered these rims for are all light enough that i did 30C front and back.
I read on bicycle rolling resistance that these michelin tyres aren't meant for wide rims, because the thread pattern that's meant to be rolled on is very narrow. But last time i checked i feel like the widest they made was 28C, so this might have changed. But it's because of that that i never bought them. I'm french, i'm curious how they compare w GP5000, given the rolling resistance tests pretty much the same and they're usually a tad cheaper.