I grow in a greenhouse in Wellington, reasonably humid and very warm in summer. First year I had trouble with pests, green shield beetles. Second year I was a bit more active with my spraying (copper won't do anything for pests) but the key difference was I kept them really well fed with hydroponic type fertilizer and they resisted the bugs heaps better. I can tell you the pest sprays I use if you like, definitely not organic but tomatoes with appropriate sprays is better than organic nothing.
I grow in 100L growing containers. Water in the bottom, platform, then soil mixture. Water works its way up through capillary action, soil's covered to prevent water loss. Works very very well. I'm still growing capsicum and jalepenos now, through winter, getting about 10 - 20 red jalepenos a week and maybe one capsicum. Tomato would still be going but they got too big and dense and I got sick of them and cut them down.
Yes, what sprays do you use? And do you also use a copper spray as well as the bug spray? I'm not bothered about not organic - easy enough to wash everything off before eating - a small price to pay for the great taste.
100L containers sound huge, is there a reason for so big? How many plants per container? Do they have holes in the bottom to allow water to drain? What do you use as the 'platform'? How full do you fill up with soil mix?
Thanks in advance!