Mainly the diameter and I felt like I didn't have touch with the forehand with it.
This thread is giving me some ?? because I don't feel like I understand the question, but I feel like you have explained yourself.
The way I interpret it is that you want an approach-distance type disc that feels better in the hand on BH than a Zone--and it needs to be a smaller interior diameter disc--and also have a solid FH hand-shape & feel.
Pulling stats for the Zone.
Diameter: 21.10 cm
Height: 2.00 cm
Rim Depth: 1.30 cm
Rim Width: 1.20 cm
Max Weight: 173.00 g
Of the ones mentioned, I have thrown A2 and Entropy. Just based on feel, I think A2 has a better BH feel for me (I shuffled A2, Entropy, and Zone while blindfolded). Entropy is also fine but is closer to a Zone in the hand.
I'm sure you know but A2 is decidedly more OS than a Zone or Entropy, but is glidey "enough" to get midrange distances on the proper angle. It's probably the best FH disc of the lot.
Another candidate that I've thrown a couple of times is a Malta. I've heard good things, and the dimensions are in the ballpark.
One thing that I've noticed is that some bigger diameter discs, e.g., Pyro at 21.5cm vs Zone 21.1cm actually have a *smaller* interior diameter, that is, where the fingers go. I just measured these four discs, and found:
Interior/grip diameter
A2: ~185 cm
Pyro: ~190 cm
Entropy: ~190 cm
Zone: ~192/3 cm