I had posted this as a new thread 1 hr ago. I can't see it. I am re-posting

What wind range will a 5.3 m sail cover, subplaning?( HSM, older model , from the 90's . )

I weigh 190 lbs and sail on a 12 ft Windsup with daggerboard. I know the basics ( jibe, tack) I sail in 15 knts winds, no planing, with a oldish NP Garda 6.2 m. For whatever reasons, may be its older design , at 18 knts or so, even with an all-out outhaul, the sail tends to become a bit overpowering and I was thinking of getting a 5.3. Will it get me going ( at least subplaning ) in 18 knts?

Thanks

Francone