Nerfing chem may be the right choice in terms of actual balance, but it is the choice I would advise Muse against the most.
If Chem were to be nerfed, it would make explaining the benefits of it to, those stubborn players we wish would listen, so much harder. "Chem prevents fires and is superior to extinguisher, please trust me." "Well.yeah but fuck you chem got nerfed, so it must suck!"
Proof this will happen, when ext buff came in, I can name several players who when asked to take chem, said almost exactly the same, except one minor difference "Yeah well, fuck you! Ext was buffed so it must be good!"
So nerfing chem although it makes sense for balance would just create more issues as far as community goes.