I haven't had this one on a dyno, but I think it would run side by side with my Dad's 9190 all day long.  I have a feeling they didn't spend a lot of time derating them (the Deutz engine) when they set them into a chassis.
I understand what you mean about not turning the engine up that much. I have enough stuff needing repair work without abusing it. The drive train is supposed to be bullet proof on them according to the White tractor fans, but I think they are reaching the limit on the hydrapower transmixer with them. I sure wouldn't want to put 300 hp into a hydrapower!