Also good argument on the dot. I'm in general against DoT for the RDM but if it's under specific circumstance as a reward sure why not (although I think I'd just prefer a big hit still xD)

I would however put verblizz/water on the gcd . As an ogcd the whole "mvm tool" disapeares as, unless you're about to move the very next second, dmg ogcd are meant to be used as soon as they're up. You would never hold on it as an ogcd whereas you would if it were a gcd.
Maybe I missed something while reading but I believe this spell as an instant gcd would benefit the whole kit much more and keep RDM coherent.
Oh and I love your blade enchant idea. It's actually really neat and definitely would fix some issue with lingering oroc before finisher / transition !