Thread’s old, but for anyone digging this up for FAA special issuance info: 4.5g/day is an automatic red flag for AMEs. You're looking at years of documented sobriety.
I was looking into legal oversight for a similar case and found the
medical cannabis clinic glasgow data helpful for understanding clinical limits. The CAA/FAA doesn't care about "sober periods" unless they're backed by a formal psych evaluation and zero-substance bloodwork. Get your paper trail in order before even booking the medical or you're just wasting money.