I am going to assume your vapor barrier is plastic. I suggest you put material on both sides of it that will not perforate the plastic, making it pass vapor. Sand on each side comes to mind.
Perhaps a sand lift, then plastic, then sand, then washed rock so you don't track fines onto or into your equipment or vehicles. Others here may have even better ideas for materials.
Regarding the slope, you need to deal with the water coming off that slope so it does not go under or in your shed. A ditch of some form comes to mind. Maybe even a ditch with drain tile at the bottom and filled with washed rock to absorb the water.
You are doing the right thing thinking about managing the water, both surface and ground. Don't forget to deal with the water coming off the roof.
By the way, don't forget to make sure your subgrade drains, not just the top grade. What is a subgrade? It is that interface between native clay or poor drainage dirt and any lift you use, e.g. sand or gravel. I have seen a lot of people dig a hole and put sand in it and build on that. Well, they just created a swimming pool under their building if the hole was not properly drained. I hope this is clear what I am talking about.
By the way, my bother ruined a good Chevy Blazer sitting on a dirt floor. Everything underneath rusted out including the brake lines. He dug down a couple inches, added a vapor barrier, sand, and put washed rock on top. Problem solved.
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