I have a 96xp with R&D head 175 psi, i am currently running stock carbs/air box. I had a mid pipe injector issue and before clearing out a blockage, I was hitting 6750 rpms but running too hot with no water in the mid pipe, melted stinger coupler.

I fixed the problem, added a post 96 (shorter spx style) water box as well. I ran a consistent 6660 until fuel tank got low then i was hitting 6700 here and there. Compression is 175.

Should a Concord 15/23 impellar drop rpms this much on my set up? The water regulator is set flush.