Whoa there, let's get all this into one area, please. No need to clutter the forum.
The Axe lives up to its name as much as any gun does. Does it perform well? Sure does.
Does the reg break? No more than any other reg as far as I can tell. KEE has been tending toward replacements for folks who do have problems, so there's that.
Pressure adjustment is done at the front of the regulator. Clockwise to increase pressure, counterclockwise to decrease, never exceed 200psi.
The Axe you have is the best one.
Functionally, they're all pretty close, mostly preference differences.
Boards are kind of subjective. If you don't need to mess around changing settings often, the Shockwave board is plenty good. Even if you do change settings, it's no less friendly than any other LED board out there. If you want to read on an OLED screen rather than count blinks and read colors, then the Redline is your board.