You'll have to do better Bump. This one was too easy to find.
Simple physics Bump.
If you keep everything parallel to the slope you have more weight on the front foot. More weight on the front foot leads to a steeper AoA which is the opposite of what is required whilst putting. Hence a more concentrated effort is required to keep the putter low leading to the accidental grounding of the putter on the way back.
Ps The rules forum is OOB. Snake infested hazard.
I had already done this one before I set the challenge and I decide where they go
what if I propose that any slope which will cause that much of a difference in the weight distribution will not have a ball sitting there to putt from?
And if, and I mean this is the most polite way I possible can, if you are unable balance your weight evenly, even on the most diabolical slope then perhaps walking upright is not for you.
I believe that you are trying to look for factors/excuses that simply do not exist in this case. If you can possibly discern a difference in angle of attack on a putt on a slope compared to flat while setting up to putt correctly, you're in the wrong game because you're not doing the golf right.