FWIW, I'm not convinced that N
:K ratios mean much. So long as there is 'enough' of the big three, and all the micro-nutes and minerals, your plant will generally do fine. Just avoid overdosing with one nute or mineral to the point that it blocks uptake of another.
During my first year I fiddle-farted with assorted chemical ferts, with mediocre results. I'm sure these can be used with great results, but I never managed to keep the plants in the 'happy zone' for long before my container soil started to load up on salt and calcium, or got flushed to oblivion by the monsoonal rain. IMO, 'organic' or whatever you want to call it, seems much more tolerant of difficult conditions. Just schlep some on and water it in, without fretting that you're about to murder your plants.
Fish soup works well enough, but I think there is a danger of salt buildup. I've stunted about half my plants this season. Most are now growing well in fresh soil, but ... "lesson learned."
I'm REAL happy with the bat poop I can scrounge from beneath the local bridges. It seems to be damn-near a "universal" fert that contains all the goodies plants need. Look for poop from the SW - mexico, Tex, Az, etc. These are generally the "Mexican Free-Tailed" insectivorous varmints that produce a basic 5(and up) - 2(and up) - 1 guano.
This guy on Fleabay sells it for a respectable price.
http://www.ebay.com/usr/frijon4?_trksid=p2047675.l2559
(Not an endorsement, just offering a potential source.)
My overwintered peppers started getting bat poop a few weeks ago and they have just about exploded. (This does coincide with the arrival or 60+ nights, so some of this is seasonal.) All are cranking out pods like mad, so I'm not at all convinced that you need to fiddle with the NPK ratios to stimulate flowering. Just feed them and get them growing, and the pods will take care of themselves.