curious, why do you assume they were ok at higher power settings, do you have some data on that because i have not seen any. since a lot of the problems i have seen on film were on take off and "bolter" situations i have no reason to believe the plane was any less difficult with a lot of power added when the flaps were fully deployed.
I assume they have a higher power setting for take-off, than for landing. I could verify it by checking the book I suppose. As I posted earlier, the POH says-
"In case of short field or runway, lower flaps "FULL DOWN," make a normal take-off run, and take off with nose high."
In other words, low, slow, full flaps, and nose high (but with power) is ok. And that's "recommended"... The warning tied to this was for engine damage, not handling issues. We could also assume that the fuel load would generally be heavier at take-off than while landing.
I'm not sure what you mean by "bolter". The issues I'm familiar with were due to inexperienced pilots on a poor landing approach suddenly going to a full throttle setting while in a near stall, generally with flaps down, which resulted in a hard left roll. "The inexperienced" part is what I've heard the "ensign" part of the nickname attributed to. It's funny, but I've experienced this exact issue with an RC corsair, and it didn't end well.