but what happens when you bring the RPM back to 2300/2200rpm for the climb
If you do that with high MAP (low rpm) you run the risk of detonation. which you will not hear because the engine is not silenced.
Probably not, in a normally aspirated engine.
As long as you stay within the limits shown in the owner's manual, that should not be a problem. Light airplane engines run very rich at takeoff anyhow, which further reduces detonation potential.