This is a trend that I can't help but love. The "I don't like this flaw of my job so here's this insane and overpowered idea that would put my job in the spotlight and destroy the job balance in the proccess."

That being said i do like the idea if PI being a cooldown to hypercharge a medica II hot. But I don't like your idea behind Riptide, while the idea of being able to put knockback immunities on people is a good idea, Riptide is a poor way to implement it in my opinion.