I not familiar with this sonic stuff but 3-C is fine if that is our accepted multiplier and Emerl copies the FEB as a whole, it should be fine. I'm a little hesitant on 3-B (that's not to say I think it's invalid though), it's just a weird feat to me, overall though if no one puts up counter-arguments then I don't have much to say.
Finally, I think all the additions are fine with the exception of the 1 layer for the ice manipulation/status effect inducement. It really just shows that that ice is colder/more durable than the other. It's like trying to give a layer to fire that burns someone that resisted a previous fire. Without context (mainly a statement) we'd assume it's just a hotter fire, not that it's layered. Same goes for ice, at least that's how I understand it. Other than that, everything else looks alright enough.