I've seen where many people change out mid for different ones , my interest lies in the Cornwall 1, with original drivers. in your case what were you seeking to hear in this range .
ie, upper mid, pure (as in the center) or closer to the upper bass.
I've been trying to follow the thread about PIO and wondered if your search took you in crossover upgrade with different caps ect. and why did you decide on speaker change.
Are you happy with the changer you made, and did you have to compromise, trade off's whether in Hi- or Lf.
I'm currently facing this road and seeking advice. I know the final decision will be mine but would appreciate your input.