Yes, both.trimming the hell out of the foil on the fly or is the foil further ahead in the window
I have been learning foiling this year with a zeeko carver wing and a paipo and every session since May has been with 12m or 9m cloud.
The max wind I have seen is about 15-17 and that was overpowering me with the 9.
A few days ago i went out with the 12m cloud, carver wing and 10 knots.
But by the time I walked out past the sandbars, it was more like 8, and 8 is being generous. There were big lulls and times I had to downloop the kite, walk upwind, grab center lines and other tricks, to keep the kite in the air. But when a 7 or 8 knot "gust" came I could get moving, and turning downwind with the small, 6"-ish chop let me get on foil, no problems after that. Until I needed to restart, then it was a little wait for the right puff/wave combination, again. I was very surprised it worked, and for me with a total of <10 sessions.
Based on my experience, at 80 kg, I would say a 14 LEI is definitely enough for any wind it will fly in unless you are significantly >80kg and using a hydrofoil not meant for light wind.