Sounds like its lean on the high speed needle or, maybe, your fuel tank is too low or, you have some other fuel system problem.

You might have to remove the limiter pins on both needles so you have more adjustment. They just pull out with a pliers.

Check your clunk line and vent. Are they in the right position?

I have this same engine. Its been fine but not overly powerful for a .46.

My GMS .40 makes more power.

Keep fiddling. You'll figure it out. I think its a pretty good engine overall.

Dave