Playing Reggae on the Hammond is a very different kettle of fish. Here’s some ideas:
Practice the ’bubble’. Many people seem to get this wrong – don’t play on the down beat, but just after it. Here’s a good video that demonstrates the technique:
The basic bubble sound is clean (no or little drive), no percussion, C3, sometimes C2; the Leslie does not always need to be on fast, the VC on its own can be very effective
888875568 (with 3rd perc for solos)
Sometimes the Jimmy Smith settings can also work well (888000000, or even 888800000), but depending on the organ you’re playing you may want to reduce the lower 8’s to 7s or 6s to soften the sound, and get a lighter more airy sound that may sit better in the mix.
For that Bob Marley sound, try 864202468 upper, 808 or 838 lower