Not particularly reliable long-term - JP Enterprises .750 Adjustable Gas Block

I installed the gas block on my 5.56 AR, made all the appropriate adjustments and it was virtually perfect, I was impressed. Since then, I've put about 500 rounds through the weapon, and recently noticed that it began showing signs of being undergassed, so today I took it out to solve the issue. I found that after turning the gas adjustment screw all the way in and then backing it out slowly to where it would somewhat reliably cycle, my ejection pattern was all over the place (between 1:30 and 5:00 ejections). If it was turned in ever so slightly, it would be quite undergassed, the same turn back out would be totally overgassed. I'm talking 1/8 of a turn, maybe, between the two conditions. It also appears the adjustment screw is quite loose at this point, even with the set screw tightened all the way down. I did contact JP Enterprises and they basically just gave me the basic information that I had already known and looked at. They weren't particularly helpful. I have used other adjustable gas blocks that were way more reliable, will definitely be using those instead.