The most important thing to always consider is that the H8000 offers 8 I/O to/from the 2 DSPs engines. Since there are more than 8 I/O (analog/AES/ADAT/S-Pdif/Firewire), you have to define MAIN INPUTS and MAIN OUTPUTS. These will be the sources for the DSPs.
Your routing is ANALOG in > DSPs > ADAT out. I don't know how you want to route the 2 dsps though, series or parallel…?
If you load internal factory routing #10 ANALOG A-B you'll have
MAIN INPUTS 1/2/3/4 = analog in 1/2/3/4
MAIN INPUTS 5/6/7/8 are not assigned
MAIN OUTPUTS 1/2/3/4 = DSP B outputs 1/2/3/4
MAIN OUTPUTS 5/6/7/8 have the same assignments as 1/2/3/4
the 2 DSPs are in series.
If you check under ADAT Outputs you'll see MAIN OUTPUTS 1/2/3/4/5/6/7/8 being assigned to ADAT OUTPUTS 1/2/3/4/5/6/7/8
That means you'll get the ADAT outputting DSP A > DSP B 4 channels in 2 copies.
You may need more tweaking for your needs.
Analog inputs 1/2/3/4 feeding DSP A