Speed runs are not a good measure of what power a set have. Now, I’m not arguing that I wouldn’t love another buff to the set.
But comparatively, I’ve got just over 3000 paragon, but most of my augments are 106 with a few at 111, and now a couple at 120.
But going by your example, I set it to 105 and ran some. Ran most of them in around 2 and half minutes though there were a couple closer to 3 minutes because I got careless and strafed into Grotesque explosions.
Then I set it to 110 and most of them were right at 4 minutes a run. Double monster health from 105 yet only about 1 and half minutes longer.
I must add that GoD is an elite hunting set similar to Shadow, if you’re spending time killing trash, I think you’re doing it wrong.
Also it’s a new set, it can take some getting used to which could explain your slower times with the set.
At any rate, I agree that it could use a damage buff but not because it isn’t fast enough at low end Grifts.