From what I saw at the IWF show, positioning of the sheets looked good on auto load features. Dust remaining after push off was hard to determine since many machines were just cycling, not a fresh board every time. I don't want to blow dust off...!! At all. I would consider that a failure of the system. I don't want employees breathing dust! All the installed systems seemed very similar. Some had a single hose connection some had more. Much of the dust was trapped between the parts and fell/got sucked out as the parts slid across a slotted opening while off loading. Some was stuck to the edges of the parts, most likely from the compression bits used. Most of that probably falls off in subsequent handling. It is not likely much of a health issue.
Back to cleaning the spoil board: None of the systems seemed to pick up clean enough. Could I fix that by installing a rotary brush in the dust hood? Seems like that would get the dust up into the air stream where it would be picked up. Yes it would require a new hood design and some simple mechanical work. But I think worth it given how many of the responses here were still blowing dust off. The brush would run when the hood was lowered and be off when raised, simple switch.
Crazy idea? Cost? a few $100, maybe 1G. What is health worth?