I upgraded my Transformer 3 years ago, when I installed 2x Ring Video Doorbell Pro's (Front & Back Doors). Now, I've upgraded to 2x Wired Doorbell Pro Gen.3's.  From what I understand, I can no longer use the Pro Power Kit's and forced to use the 'new' Chime Kit Mini's.  

So, I have removed the 3 wires from the wall chime, and wired both Chime Kit Mini's to those 3 original chime wires. (Can't find any definite wiring diagrams for my setup).

Do the Chime Kit Mini's add some type of power stability?  Only 1 of the Chime Mini's seems to operate a doorbell correctly, the other Chime Mini does not.  If I swap the Chime Minis, the opposite doorbell works, but never both doorbells at the same time.

Please help me get both doorbells working!