Big Ugly, you really don't need a lot of air flowing. All that you need from it is to keep the powder fluffed up and fluid. You'll see in video's where folks get a lot of bubbling in their powder and frankly, that's wasted air. You're coating with the powder, not the air.
You should also make sure to keep the powders dry. You can't see it, but fine powders of any type tend to absorb moisture. Moisture in the powder, which can be from humidity in the air, affects the flow and how fluid the powder may be as it causes the particles to stick together. That means more powder than is needed transfers to your heated jig, and a uniform and thin coat will be better than a thicker coat.
Be sure to keep the powders sealed when not using them and I place packs of the silica gel in the containers to absorb moisture. I've learned to tell when a powder isn't as fluffy as it can be, and that's usually a moisture issue if I can't seem to get it to fluff up.
Kept your powder stirred well too. Even though the fluid bed aids in keeping the powder flowing, it may not be perfect, so helps a lot to keep it stirred. I notice that powder packs a bit when I tap the excess off, and there's a difference in the powder when dipping. When it's nice & fluffy, there's almost no resistance, but when it's not, then there's a good bit more resistance and stirring fixes that.
When I dip, I heat jigs to my cure temperature in an oven, then it's straight in & out, no swishing around because the longer in the powder the more powder on the jig, and again, as long as you get a thin & uniform coating, that's all you need.