I'd check with the lift manufacturer for recommended concrete specs and work towards that- there are a lot of different lifts out there.
I'd do the same with the epoxy manufacturer recommendations.
My FIL put epoxy on his slab but did not have a vapor barrier down under the slab. The migrating moisture relentlessly pushes that epoxy right off the concrete- no matter how good the concrete-epoxy bond is, so please consider a vapor barrier under the slab.
Best luck with concrete work- The warm moist weather in the midwest will be good for the concrete cure. Better than hot dry sun, anyway.
S-D