Impact M3 front regulator wont fill past 50 bar, Disassembled and No Sign Of Anything Wrong

The issue started when I took my gun out after it had been sitting a few days. It had been functioning perfectly up until this point. The bottle gauge read 20 bar. It had been at 210 bar when I last put it away. I took the bottle off and immediately the bottle began degassing until it was empty. I removed the bottle valve and took it apart. There were no damaged o-rings but there was some dark colored lube coating some areas inside the valve. Strange. I wondered how it had got in there. I removed the o-rings to clean them and where they were seated. Cleaned everything up. Lightly lubed the o-rings with silicone oil. Put the valve on the bottle, screwed on the bottle, it gassed up to 100 bar. I unscrewed the bottle and no degassing occurred. Great.

Screwed the bottle back on. Bottle gauge read 100 bar, but the first reg read 50 bar. I've always kept the first reg at 200 bar, so it should be at 100bar as well. I removed the bottle to confirm that the first reg screw was set the number of turns that it always has been. It was.

So I removed the first reg and took it apart. There was a little of that dark-gray colored lube on the surfaces inside. I cleaned it up, but could find nothing wrong with the o-rings, washers, no obvious blocks over the tiny holes. The plunger surfaces looked flawless. I disassembled everything, cleaned, added fresh silicone oil on the o-rings. Restacked the bellville washes just as they had been before. Reattached 1st reg. Screwed on the bottle and the bottle gauge went to 100 bar but the 1st reg gauge rapidly bounced between 50 and 80 bar for about 2 seconds, settling at 50 bar.

Don’t know what to do at this point. Maybe one of the little holes in the reg has some of that strange dark grey lube or other debris clogging it? If so, how would I clean out such a tiny hole?
Let me know if anyone has any ideas.
Thanks guys.
 
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Update:
The rear reg was also reading 50 bar - same as the front. I swapped gauges, added more air, still the 1st reg wont read higher than 50b. I had a saber tactical bypass gauge that I had been wanting to try and this was a good opportunity. put it on and everything is working better than it ever has.

I've had the gun for several months and it has always had a velocity variation of +/- 7fps. It was common for a shot string to look like this: 990, 985, 995, 983, 996 etc. But I was still able to get 1" groups at 50 yards. Being that the groups weren't bad, and I'm new to airgunning, I didn't reach out to Utah Air, which is where I bought the gun.

But now w/ the 2nd reg bypass all my shots are +/- 2fps, but most of them are +/- 1fps. Now groups are .25-.5" at 65y, which is as far as I can shoot on my property.

I'm going to ask Utah Air if I can ship the reg back to them for inspection, and/or replacement. I'm not expecting they will since I've had the gun a few months, but if you get a $2.3k gun w/ a bad reg, you'd hope someone would offer some sort of compensation.
Maybe I should reach out to FX, as well.
Thanks for the help guys.
A bum gauge bit me once. Lots of wasted lead because of it. Sometimes it’s the simple things that we overlook on complicated guns. Next question is what does your back gauge read when the first reg gauge reads 50b. If it reads what it should then your first reg being 50b is impossible.
 
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