Pannanorge - Nothing really wrong with what you did but I might suggest a simpler config just to get up and running.

1 - Ensure "Play Mode" is set to Master.
2 - Change from your current MIDI config to "Standard"
3 - Under Rx, set Global to "1" and for now, everything else to "Off"

That should be enough for you to set a split point and play left and right-hand parts. Does the delay only show up when using LaunchPad?

We only activate other RX channels on the SD90 when we are working with a DAW and using the SD90 more as a sound module.

I can't speak to the Genod config as I don't have one but basically, you want it to send out on channel 1. For the Genos sliders to control the SD90 you will need to make sure the Genos is sending controller info out. It might do that by default - Don't really know that answer but others on here will.