OK, I confirmed that running it on low speed (1,800 rpm) is more than enough to run the SWCG. The issue I have now, is the SWGC only runs from the main "Pool" setting. The "Pool Low" (which is the 1,800 rpm) setting won't power up the SWCG. Which explains why it didn't seem to be working.
So I guess I need to reprogram the speed on the main "Pool" setting?