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Slow riding is boring though.
Why do you ride off road then?
I don't mind stuff like GK SKs or the Cinturato on the road because they're even tread so you don't get weird shit going on in corners. But I have a road bike so I would normally ride that (with my slower road tyres).
I only road the 200 with the gravel bike because I wanted a shakedown ride before Badlands and I'm glad I did when the tubeless failed with 15k to go.
I've done 200k audax with 50mm GK SK+ tyres on. It wouldn't be my first choice for a road race but if you're not racing does it matter if a road ride takes a bit longer?
Actually I just had a look because we did the same route on road bikes and I was 45min slower on the gravel bike off a 10W higher NP. 4600kcal vs. 5200kcal on the gravel bike. Definitely a difference (obvs, knobby tyres vs slicks!) but unless you're racing does it matter? It doesn't to me, that's why I favour more durable, heavier tyres until there's a stopwatch and finish line involved.