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Spend $50 on a non contact moisture meter rated for concrete. Make sure your system is ok with whatever level you have spring/fall.. Floor grinding with a diamond cup grinder, followed by SLC (self leveling compound) for the low spots would minimize the SLC needed. Follow your vinyl flooring manufacturer for sealing/curing/dryness.


The goal is a smooth, flat surface for the vinyl to lay on. If you can do that with 1/4, then that is great. But in your case it sounds like you need to step up to 3/8 or 1/2 depending on the gap. Once you put that down, then there is no need to add 1/4 plywood.

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