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That looks really fast! (And the wheels look far too narrow for the frame )
For me, the air does not hold as well as in the butyl tubes.
I run 35mm with 3.5 bar, after a week it's still 1.5 bar.
Nice looking rig! Do those TPU tubes hold air well?
Who in their right mind would go with the gatorskin unless you know nothing about cycling?
I run GP5k's and haven't had a puncture in over 2 years now, that's with riding a good 30,000km over shitty Australian roads.
You can make this mod to the GRX 11s derailleur by using an XT cage to make it shift an 11-51 Shimano 11s MTB cassette:
https://www.youtube.com/watch?v=ynpFsE8snww
I would look into some kind of shimano grx setup , 1x , 11-51T cassette seems appealing to me.