Yes Tuck, sure I used monofins. Not to push the puck though, but I have no doubt that its possible to do it much faster than with bi-fins. I do a lot of monostyle with puck and bi-fins... there's difference in stabillity as is also with higher speeds using monofin vs bi-fin. For uwh monofin, there should be some vertical stabilisers on them, but the rest should be in the hands of person using and training with them, to get it right. The stabillity of a monofin is surely a consern here! Also the abillity to push&control the puck on the stick at those speeds is a potential problem.
You know, when I saw the 2 meter long flick for the first time, I asked the guy: Can you teach me this trick you did with a puck?...

His answer was: What trick? I havent done any...?
Again, only tests will tell the story. For the right results, the tester should use monofin for short distances. They are smaller and tougher than what you might be using now... also the stabillity issues are going down, as the speed gets up.
Gear drag is important when entering the speeds of the monofins. Drag goes up exponentially with higher speeds.