Cricket .25 won’t fill past 210bar?

This just started. I always fill to 220-230bar. It’ll fill to about 210bar, and the probe begins leaking. I checked the orings and greased them good.. It was actually leaking at 190bar and so I greased and inspected, and now it’ll go to 210. My probe was always finicky and needed grease.. But it would always function fine. I have an SCBA tank that’s kind of hard to control the old valve on it so it wants to give pressure quickly which fights against the Cricket which only accepts air slowly. But the probe should be able to withstand 300bar without leaking..