Since you don't mention what your sample clock lock sources are, this suggests that your systems are not locked to each other. When you are trying to connect multiple digital units to each other, you need to know what you are doing.
I would suggest that you define one of your units as the Clock Master (probably the Apogee), set its clock to internal and then lock everything else to it. This means that if, say the H8000 is connected to the ensemble using ADAT, you set the H8000 to lock to ADAT.
