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For all-weather protection, the Sun Top (bimini) is basically worthless at any speed whatsoever.

Having extensively cruised the waters of the BC Inland passage in an Outrage 18, all the way north as far as Port Hardy, I can say you DEFINITELY need the Mills Flying Top Set as mentioned, and also the Side Curtain set. It will keep you dry, warm and out of the wind. The totally enclosing Aft Curtain can be considered optional.

Don't bother with after market, locally designed stuff. The Mills is superior quality, fabrication and design, pre-done and now with computerized fabrication, sold in conjunction with Boston Whaler since 1958. It fits the boat perfectly, and comes with complete installation instructions. It is what you want, and will cost less, although the complete set will still run around 3K. For the kind of weather you are boating in, it's worth every penny of that cost.