I hope that everyone is having a great Thanksgiving weekend!

I am having a small issue with my OS 46AX. I hope that somebody might have some input.

My 46 AX runs well and starts well. I have put about 1 1/2 gallons of 15% nitro through it.

Tt idles well. full power at full throttle. The problem is from 1/2 to 3/4 throttle.
I hope I explain this right, please bear with me. It starts and idles. I slowly transition up to 1/4, then 1/2 throttle. No problem, rpms rise.
But from 1/2 throttle to 3/4 throttle, there is no increase in rpms. It's not bogging down or dying, i8t's like it is being held at the same throttle. Then, from 3/4 to full throttle, the rpms pick up to full power as they should.

It's flying great like this. I am just wondering if any of you would no what would cause this "dead zone" between 1/2 and 3/4 throttle. I looked at the throttle barrel, and it is opening consistantly from idle to full throttle.

Any ideas?