If you want REALLY good CAD conversion I can recommend InstaLOD. It allows you to have fine control over every single object in the STEP file, set detail settings for every single one, automate repairs, clean up the materials (so you don't end up with metal.01, metal.02, metal.03, metal.04, ...). etc.
There is a free version currently, but you have to request a license manually. https://instalod.com/fsl/
We're using the tool for over a year now for all our CAD data needs and you wouldn't believe how much time and nerves this thing saved us.