RE: Why such a big variation in watts on my Integral?
I agree with Woodie. The graphs show the Rhinos with higher average voltage throughout the flight - that coincides with the higher average watts also. The Rhinos have a more consistent top peak of 2200 watts and a higher voltage during the peaks.
As an aside, I also bet the packs were cool or cold when you flew them as the Rhino's voltage should not fall that far under load unless the packs were cold. (Cold = 80 +F or below).