I would go even lower for Michelins.
I run 32psi/34psi. The carcass works differently from other tyres. That's for single rider, unloaded and cold measuring.
Continentals or Dunlops I would run up there, but not Michelins , especially the control carcass tyres.
A Michelin should feel compliant. If it feels harsh you have too much air. I get good mileages out of my tyres and no bad wear patterns.
My TR650 I used to run 28/30 in PR4's and they did about 10000km and were still very serviceable ( the front very little wear indeed) when I sold it. That bike weighed about the same as the CB500X.