I'm fairly new to combat, and fellow combat buddy gave me this tip:

"After breaking in a new OS.15LA you may notice the engine will loose power. The screws on the backplate and on top of the cylinder head are prone to loosen up a bit. If you tighten these up you will regain the power again."

I personally haven't experienced this yet, so I can't tell you how applicable this tip is. But it can't hurt to tighten the screws on the cylinder head, if you haven't already.

Juice