I suppose you'd best be slaving both the Apogee and the D8B to the same clock, OR using the D8B as Master to the Apogee (which would be sad).
In my (meager) experience with saving clocks to other stuff, it's so obvious when something is not getting good clock (big distort spikes, fuzz, etc) that I might assume you are covered with the setup you are using.
Even tho the Aardvark is supposed to be very good-- can the D8B and other things slave to the Apogee? You might try slaving everyone to the Apogee's clock and compare that with the Aardvark, as the Apogee is supposed to be a good master clock as well.
Once the clock issue is settled...
If you take the Avalon out of the chain, you can just compare the D/A circuitry and analog outs of the PSX and the CD recorder. They are probably of very different quality.
What does THAT sound like?
Double check that you are not comparing one machine's +4 signal with another's -10 signal.
After this, you'll be able to put the Avalon back in the chain and see what that does to the signal.
Let us know!