Okay. Got the rest of them soldered all up, cleaned, and tested. I'll send out the remaining payment requests here shortly. I will also add some installation tips in the first post to prevent issues I've had in the past and prevent possible damage to the D7105C chips.
I think it is possible I damaged the two chips I found to be faulty myself with the method I was using for testing. I orgiginally was testing by turning off one machine, swapping the link pcb and plugging in the cables and rebooting. In the 8 I tested like this I was getting weird results. I began turning off all cabinets while swapping and rebooting after to test. Using this method every link pcb booted properly. I restested the first 8 and 6 booted properly and the other two had faulty D7105C chips. Testing these last 13 I just finished producing there were zero faults. I now believe it is possible I damaged the two myself during testing so I will now make sure to insist that you do not turn on any of the four setups until AFTER they are all connected.