My answer was strictly about comparing forecast models; I never compared Windy (I love it) to similar web sites.
Anyway, as a moderator, if you would consider it as a spam, please feel free to mark it as such.
Nevertheless, I just tried to help Windy users to get the best results from Windy.
Did you checked all available forecast models in your area?
CAPE is just the result of a formula, while some models are not so good over areas having specific microclimate; e.g. GFS0.25° grid has a resolution of ~25 km, far not enough for best results over such an area.
Generally speaking, CAPE is not a magic number; forecasters use it in conjunction with other important parameters and analysis to provide best local forecast.
Nope, there is no option to edit isolines interval (only palettes may be customized for color shading data layers).
Users often ask for such a feature (e.g. in these threads), but it was never implemented.
But this model, like the other global models, is not so good at predicting the maximum wind speed near the eye of hurricanes. In any case it is better to rely on NHC advisories.
As you foresee long passage of several weeks, do you get broadband internet connection at sea, or do you stop every 2 or 3 days by calling at ports or mooring areas ?