Hang on - we might be missing something here, and the OP's last post gives a clue.
After departure, leave the throttles but reduce RPM from 2600 - 2500. There's nothing wrong with an adjustment this small for noise reasons without touching the throttles. I was taught this, no doubt many others have been as well.
HOWEVER - it is the only time you do it. Thereafter it's always throttles back first, then Props back. Going the other way Props forward first, then Throttles.
And for the "over square" gang - go fly a Turbo people and discover that it ceases to exist. Even a normally aspirated IO540 is flown "oversquare" on departure and you just let the MP come down naturally, whilst leaving the RPM at 2500 for the climb.
(I delivered a Seneca V from Europe to Brazil - 2200 RPM / 28" MP was a nice cruise setting for that trip)