Yeah, I would roll with no CVars unless you see a visual reason to use one. You are probably just increasing render time without much visual value. There are times when you need to use them but I would wait and see if you need them. Sometimes these lists people find online hurt more than help.
Setting the AA to none is fine. 64 spatial samples should be plenty for what you are trying to render. Basically when you set the AA to none each sample will jitter the camera to a different position to do your AA. So you are getting “true” AA rather than an approximation.
In case you have not stumbled upon this yet, it might help explain some of how MRQ is working.