Can you turn off the HP alarm?
I have a SRW. The rear tires start at 80 psi and the pressure rapidly builds at highway speeds especially on a warm day. When the pressures go over 93 psi, the system stops working. I don't get an alarm but the pressures read "254". Again, I cannot see the final temperature but it must continue to build in to the range of 95 to 100 psi.
Do not put less pressure into tires that are working hard. Be sure you are at 80 with totally cold tires.
I know my tires are running at close to maximum load. Unfortunately I have 17 inch rims and the only feasible upgrade seems to be to spend a small fortune going to 19.5 rims and tires.