Speaking from 5000 ft, your going to have a significant overall power loss in rpms and performance. Add in the DA and half a dozen other things and the engine performance will drop. If you feel your plane is running like crap , it is but at no fault of the engine. You'll have to retune and maybe go down in prop size, not up.

If the engine is losing power, I don't think going up in prop size will help.

You probably should just wait until you get their and try it out first. As long as your aware of the potential problem and "feel it out." Dont try any stupid stunts until your sure the plane will follow though on it all.

I've seen guys come from Florida with Turbines and try flying here and tell us to shove it. So we just sit back in our chairs while they're out in the fields picking up the pieces from over shooting the runway for the 10th time.