I had the Erdmann. Sold it. The position is too far back. Imo it’s worthless . Maybe if you got tiny hands.
Enjoy it as is. If you want the next level Cz get a Tso . Tso thumb rest is perfect for my hands.
Just shows we're all different, I guess. I wear XL or XXL gloves, so far from tiny hands, and I like the Eemann Tech rest (I assume you meant Eemann and not Erdmann).
I'm sure the TSO is a great gun, but I don't think it's production legal.