AeroTech - performance charts don't give different stab trim settings for derated vs. max power.
With wing mounted engines, and the thrust line below the C.G. resulting is less nose up force by the engines, there's additional pitch force needed on rotation and retrimming after liftoff.
If there was a significant drag change I'd believe our performance charts would reflect that. Since I've never heard of it on DC-9's, A-300, or various Boeing models, I have to assume any difference that might exist is too small to worry about.