I have a light modded 23lt and I am turning 3850 in water with a 9x7 running 22mph and turning a 9x6 4000 running 22mph....any ideas???? Am I topped out or can I get more?

With those props I doubt you will get anything higher. You are probably running about 20-21 at 3600 and then that. I think you are at the top of the curve right now.

So would getting someone such as Hopkins to tune up a prop to say 9x8 or 9x9 help any?

Might wanna wait and see if someone with a similar motor chimes in.

Ok man, appreciate it. I did go run it again today and added some octane boost and got 3950 and bumped 23 a couple times with 2 of us in the boat...only reason I tried that was I was having a detonation/preignition problem and was trying the octane boost for that problem.

What size boat is it on?

Without doing more mods it sounds like you are about peaked out.
What have you done to it?

Woodie, it is on a 1652 riveted flat with frog spit on bottom. decked heads 15, bored 30 over, polished and 3 angle valve grind, 35 carb, twin exhaust, high flow s&b air filter.