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amp reg question

I am not one to tinker with the settings aside from the trigger just not needed for the type of shooting I do ,the factory settings have always been the way I run my guns and have not touched a regulator except on the impact,my question is how much turning on the adjustment screw do you make ? The only info I could find is that you have to pull the trigger every 1/4 turn when adjusting,but no matter what I did could not get it shooting any faster then 780 fps,and it started dropping fps going in the same direction that was speeding it up,are the adjustments really tiny ....like a 1/4 turn is a huge swing. I am confused is there another adjustment I should make. I thought the .30 wildcat was spose to be around 820fps out of the box