I have near 3 decades of experience with the Whelen, with several dozen successful hunts, it has been a hammer, without fail, 2500fps. As of last year, my go to load is anear case full of PP2000MR under a 250 gr Partiton. While I did not feel a need for more velocity, the accuracy of the package could not be ignored. It just keeps getting better. Overkill is under rated.
You are the first guy I have heard of using PP 2000 MR, have you had a chance to run it over a chronograph yet? I would love to try some of the new powders with some 225's, have a great 200 gr load but could do some experimenting with the 225's to see what happens.