Definitely try that 21p, then report back.

Sounds good. I'll let everyone know by the end of week. Thank you.

Aside from changing props:
- Make sure prop is in good shape.
- Pending the type of prop you have, make sure you do not have a spun hub
- Drive should be ALL the way tucked in when planing
- You can try trim tabs all the way down, you can also try about 1/2 way down.
- See if you can turn/saw the wheel gently back and forth to get the bow/hull to "surf" it's way up on plane (broadside of bottom of hull, vs. cutting the water like a knife)
- Sometimes, you will see raceboats do this, or boats propped for top speed: Push throttle forward until the prop starts to blow out. Then yank the throttle back, and the wake will hit the back of the boat. Then use this wall of water to bury the prop into (less ability to blow out), and the wake hitting the boat will also surf you up a bit.

The key to get this boat on plane with 5 people on board is to have the trim tabs all the way down and to pin the throttle all the way after 1,000 RPM. I was babying the throttle before when the boat was failing to get on plane causing the boat to plow through the water.

It should run 59-60mph with that combo. I had same boat, same power, and 23 Mirage Plus. Getting on plane was hard with 4 passengers and full of fuel.
A 22 Bravo 1 will change planing out immensely and get rid of the porpoise at cruise speeds

21 and 23 pitch mercury mirage 4500 50 mph max.

This might help getting on plane

They helped me get on plane and stopped some of the porpoising,

How's the structure of the boat? Maybe you got a whole lot of extra weight in wet wood

So you run the same rpm with a 21 and 23 Mirage???
If so, its sounds like you're down on power, have a hook in the hull or have a wet hull thats weighing it down.

24 Outlaws need to be trimmed way up to get top speeds. Are you trimming up until you stop gaining rpms or speed??