Hi Julia, it's possible he is dipping low at nights and bouncing during the day. Some cats go high before they break a bounce so don't let a high PS number deter you from getting mid-cycle tests. My Bandit can go from 300+ at PS to 50s by +5/+6 and then back up again by the end of the cycle.
Is there a reason you haven't been getting mid-cycle tests in the last 2 cycles?