When the bolt is loose, is the hub tight or loose when sliding on the axle. If it is loose or easy to slide on, this might be your issue.
You really do need to use spacers which guarantee not to slip inwards.
Silly question, but how does that work on sprocket side? Spacer pushing on sprocket doesn’t seem to be the way to go?
Enjoy those moments Derek! Won’t be long till they will be leaving…have one starting clinicals to be in occupational therapy and my racer is a senior that is bigger than me. 
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@LRMcDouble as other have said, clean, clean, clean. Also some lube on the bolt threads, even just grease if its all you have. We have used talcum powder in the past works well. Also used very dry powdery dirt at the track when we had nothing and were having repeat slipping issues. Worked surprisingly well!!! Only time we have slipping now is if someone smokes us and hits on the rim or we screw up tightening stuff.
Something like this may work.
I just tried the chalk trick after cleaning the axle and removing a few burrs from the hub… it seems to work! It’s cheap, plus we have enough sidewalk chalk leftover from our daughters driveway decoration phase to supply several teams!
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It was very grimy, I had to use a brillo pad to clean with brake cleaner because it wasn’t coming off any other way. I hope that didn’t remove much material. But I sprinkled with baby powder after and I guess I will see next time out how it did. I will report back.
They go inside the hub and push on the end of the axle
Ha! That’s my cadet-dad ignorance then. Our hubs slide fully onto the axle. I get it now, thank you!