I have the 910's and keep them around 38 psi. My sidewall says 44 max psi,..check yours.
How does your car handle? Add 3-5 pounds to all 4, then go for a drive you- should feel a difference. 3 lbs made a diff. for mine.
Use a quality air guage too.

98.5 SVT
93RX7
86GT 377ci