You should not be inflating 32 mm tires to anywhere near 100 psi.
Unnecessary and eliminates the advantages of wide tires.
Depends on the weight of the rider.
I've never considered 27x1-1/4 to be wide, but for some reason I consider 622X32 somewhat wide???
Probably the difference in typical 27" rims and 700c rims which tend to vary from skinny road rims like my Sun Rim M13 II's to extra wide 29'r rims.