The short jumper cables from the BI-AMP outputs to the PWR AMP inputs can be instrument cables, as they are shielded.
Use only speaker cables between the power amplifier outputs and the speaker cabinet inputs. Use Speakon cables with genuine Neutrik connectors and standard pinout: +1 and -1.
As it's possible that no-one has hooked up the same rig you are doing, and we don't know your sonic tastes, it's difficult to recommend settings. Read the manual to understand the use of the crossover frequency and balance controls and find what works for you.