Getting air in the lines somehow

I received my DoctorDiff Aluminum MC and it solved my problem. DrDiff said it sounded like an out of spec piston or bore causing it to loss pressure. Now I just have to fine tune the adjustable pushrod length on this new set up, but she stops on a dime now.
I got a call from Right Stuff today and they’re sending a replacement MC that they said to go ahead and sell to recoup my loss. I’m fine with that. Anyone need a new 15/16” bore manual MC? I’ll be at MoPar nats :)