I've always used only one "A" record for main domain like "domain.com" then everything else goes throught "CNAME", like "www.domain.com" or any oher sub-domain

I've always used only one "A" record for main domain like "domain.com" then everything else goes throught "CNAME", like "www.domain.com" or any oher sub-domain like "blog.domain.com" then have sepeate "MX" record for email. In Nginx I redirect useless (www) to (non-www) using permanent redirect (301) Never had any problems both with CloudFlare and NameCheap ^_^