AirMaks Arms Krait slow first shots after sitting a few days

My Krait was doing great, consistent and accurate. Several weeks back I lowered the spring tension which actually added FPS and made the rifle much more quiet. Quiet was what I was looking for as the gun sounded like the hammer was striking harder than it needed, which turned out to be true. Now for the last week the gun shoots quite a bit slower for the first several shots and settles back in where it should be.
The thing I noticed as I keep an eye on it is that the reg is very consistent and returns to the same pressure after each shot, it's also on the correct pressure before that first shot.
This has me thinking,..........hammer spring tension.
Maybe I lowered it too much to overcome any setting in after sitting a few days??
Thoughts before I start messing with it.
 
My Krait was doing great, consistent and accurate. Several weeks back I lowered the spring tension which actually added FPS and made the rifle much more quiet. Quiet was what I was looking for as the gun sounded like the hammer was striking harder than it needed, which turned out to be true. Now for the last week the gun shoots quite a bit slower for the first several shots and settles back in where it should be.
The thing I noticed as I keep an eye on it is that the reg is very consistent and returns to the same pressure after each shot, it's also on the correct pressure before that first shot.
This has me thinking,..........hammer spring tension.
Maybe I lowered it too much to overcome any setting in after sitting a few days??
Thoughts before I start messing with it.
It's likely regulator creep. As the pressure rises in the plenum the hammer can't open it as far and the first shot or two will be slower. Common problem with regulators. Do you have the Huma regulated Krait? I haven't noticed creep in mine so far. Also if you are having to lower spring tension to get higher PSI shots, your spring was adjusted too far in to begin with. A good tune is to find the highest fps you can get with the spring and then back it off to 3-5% below that number to have good shot count and still be consistent. And if you don't have a digital gauge for the regulator pressure you don't really know if the reg increased or not. My airmaks gauge seemed accurate until I threw a huma 25mm on there.
 
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