Airmaks katran regulator help

Hello all. Not sure on this one. My katran shoots hotter the lower the bottle pressure. I set speed at 950 with Cphp I was at 140 bar. Decided to fill up and filled it to 230bar velocity had dropped to 600. +/- 10fps for several mags very consistent. As I get closer to 200 bar the speed is going up. 630 ish. I know it has some creep as my first show is alway low. I’m just confused on the high pressure low velocity. Reminds me. Of shooting a non regulated gun experiencing valve lock. Would this be due to the reg not venting or breathing to atmosphere?