I used to have trouble performing pinch harmonics, I used a .52 pick for everything and pinch harmonics were achievable, but scarce.

I changed to a medium pick (like .68 or something) and now I can do them all the time! I use my index finger for P.H. though, is this natural?

I figure if it works, it works, but so does flat picking (took me forever to lose that habbit) do you know what I'm talking about? :)