Top tip don't know anything about the higher flow rates but I'll ask, currently the cylinder's 15 lpm. Certainly it can be limiting if you're trying to up your metabolic rate when you're on the tank. Happy enough with the mask I use it basically vents O2 into a bag you breathe out of - might try a bigger bag in the meantime.
The one nailed down trigger I have noticed is the hot bath, which is kind of ironic since in the dark undiagnosed days immersing my head in a really, really hot bath was as close to relief as I could get.
Definitely trying a cheeky white wine tonight, and sticking to the programme - alts, O2, Red Bull, black coffee and seriously hot chilli peppers.
Only noticed the chilli making myself pasta the other week. Since it was just for me, not the family, I used a dried habanero for heat. The result, however tasty, certainly wasn't child friendly but did noticeably clear the head for an hour or so.