Like many I have been on this slow increase in tire width and slow decrease in pressure. Currently I am running 30mm (31mm actual) GP5000 S TR tubeless at around 50-55psi for my 170lb me+bike weight. In the summer I will bump that up ~5psi. The Silca calculator says 65psi for me.
When I first got the 30mm tires I was running 70psi which probably gives optimal speed on reasonably smooth pavement, but the handling is so much better at lower pressures, both for smoothness of the ride and for grip when you need it. Especially in winter I really appreciate the lower pressure as the roads are wet much more often and the grip can be minimal at times.