i can tell you, that the gold in Genki M.O.M. Hard, IS possible... i managed to beat it with 3 seconds to spare... you have to have alot of luck, use some strategy (like grabbing a car before heading to the third area cause cars dont like to spawn there just when you need them) and also you should beat the platforming rifts on gold first, as the glide and jump distance unlocks speed up movement from area to area by a few seconds
i believe that and the speed rifts, (and also possibly the blackhole mayhem) are the hardest activities in the game (at-least for me), and im pretty sure the speed rift one comes down to awkward controls, would probably work better if they were remapped to the mouse
I have everything except Genki M.O.M Gold and TK Rift Gold. In fact, I'm thinking Genki would be easier if Tornado could be disabled without disabling super run, so that I stop blowing everything I want to grab across the world lol.
Also, maybe its just me, but if I try to travel too far with something (anything, car, person, Genki head), it de-rezzes before I get there.