Re: 1-Ply Snare Heads
I have 3 snare heads right now- the Clear Controlled Sound ( basically the same construction as your evans ), the Coated Ambassador (10mil), and the Vintage A (7.5mil and 3mil, very close to single-ply). I agree with your assessment, after using the same one you used to use the Coated Ambassador (my favorite of the three) is so much more sensitive than the EC.
Heads up- if you ever want to get that oh-so-popular djent-style snare tone, a clear Controlled Sound medium-high and a cranked reso are the heads for it. Especially on my stave snare.