I've been growing peppers and tomatoes in containers for years too. As already mentioned, you'll have to fertilise more, although slow release ones cut down a bit on the frequency in pots/containers. Peppers seem to prefer that their feet aren't sitting in water, so let your containers drain into saucers and then recycle the outflow elsewhere.
Of the ones that you're growing only Islander is one that I haven't. The others have all done well for me in pots/containers. Good luck.
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