I'm adapting my own weird ZvZ strategies that aren't muta related, mainly because the new style ZvZ just reminds me too much of BW ZvZ... if you ever played that, my god it was boring!
My ZvT is pretty standard like yours. I prefer when a Terran goes mech, I feel I get the upper hand with Roach/Hydra!
ZvP I quite like to contain with swarmhosts, then into Roach/Hydra/Viper
Masters doesn't seem too much of an achievement these days, I don't feel like I've tried hard enough to be in masters, more so, bumbled my way into it without really knowing any of the new build orders and certainly NON of the new timings...