How does adding a DPP33 create five or six bands from four? It seems like there could easily be a situation where all six tuners might need more than two double-stacked cables from the LNB can deliver.
What?!?
It's really very simple.
2 wires from the dish to the DPP33 (or in the case of the OP 1 wire from each dish). 3 wires from the DPP33 to the duo node. Job done. End of story.