Mark _australia said..
I would not worry, best advice I ever had was "you can only have one sail in your hands at any time". So does it matter if you have a 5.2 "power" wave sail, or a less powerful / sideshore oriented 5.5? As a heavy guy I thought I had to have powerful wave sails and its not true. More stable yes, but sizes are irrelevant.
And this is even more true for you if you're only using 3 sails - as you will use every one of them underpowered at times, and overpowered at times. So why would you worry about 0.2m difference when changing brands? You will still use all those sails under or over powered at some time.
Haha. So true. However, if you are advanced, not sure we can advise here..
Personally, if walk to the beach where I sail (one block away) I can only carry 2 sails roped to the boom and they better cover good range. I'm very rarely wrong with 2. If I drive to some spot, I usually take 2 sometimes 3 sails. Less is more... I would get 3 unless 4th sail is on tap. lol
Also wind min-max during any session is usually such that, the dif between 4.5-4.2 may not be material. And for 3.7 to feel awesome it should equally blow strong and even. I do have 3.7 but where I sail 3.7 wind is very uncomfortable and rare. So if I dropped 3.7 from my range I would maybe miss 1 session a season.