When I went to the Winter Gardens, Cleethorpes, in 1983, there were a lot of black West Indians in atendance mainly, I think, because it was a modern soul night.
It was also the only niter I went to where you could see dancers trying out their back-spinning!! Would I lie to you..........?
But I digress. To answer the original question, I think it's more a case of very few West Indians having an interest in 60s soul, particulatly fast and stomping soul. Interest seems to lie in the two-stepper soul/funk records more than anything else. I can't answer for the modern soul scene though; things may be different there.