Most of the time, the ol' 182 is so draggy, I only need two power reductions. One just prior to entering the pattern so I'm not running over Skyhawks, and one abreast the point of intended landing.
Otherwise, just pointing the nose down and enjoying the additional speed, is fine.
Only time that's not wise is in really rough air.
I know there are aircraft that need more attention paid, but in the 182, it'll slow right up at that first reduction, like someone pulled the parking brake handle.
And I don't see much indication the O-470 suffers from enough airflow for the "shock cooling" myth/drama/debate in any real world data. One other 182 owner here does his 1" per minute reduction religiously. I bet we both pull the engines off around the same number of hours. I don't yank the thing, but I do just smoothly change it.
Move that reduction to further out for flying an approach, of course. But, she flies better approaches at 110 than 90, as my DPE showed me. The Robertson kit seems to set up a long slow porpoise in pitch that messes with airspeed control at 90, that it doesn't at 110.
It's one of the things I love about the older Skylanes and the fat Continental. Simple power-plant management.