Experiment w different pressures, see what feels best to you.
I think mfg recommended pressure should be used as a guide, not gospel.
A tire w a higher psi rating is probably better made and able to handle higher pressure.
Rider/cargo weight, road conditions, and type of riding (urban vs country, for example) are other factors affecting
optimal pressure.
Again, in my experience lower pressure is sluggish but more forgiving of bumps, while higher pressure more responsive=better handling and faster, but of course you feel road imperfections more. I actually feel safer w higher pressure than on a "soft" tire.