There is your problem. Not enough light. You said leaves are dark green. More light will intice them to flower. Personaly I wouldn't use the mix with peat in it, but thats me. Remember I alsway say that what works for one may not work for the other. So if your not getting root rot the go with it. Many folks have had success with peat in their mixxes. The balcony sounds good to me once your temps stay above 55 at night. I said 60 earlier because thats my safe, but 55 and the occasional 50 is ok. If you grew cymbiums then they can take down to the 30's, but to be safe with those types 55 to 60 is acceptable mins. Now when you move them to the balconly keep them close to the back wass and aclimate them slowly to the higher light or you will see signs of sunburn and things on the leaves because they are not used to it. You will notice the leaves yellowing up a little with more light. You may not see flowers on the newest growth, but then again you might. I hope you do. You will need to judge the plant as you increase the light to see if it needs more or less light. Dark green for that type of plant is not enough light. It needs to be green, but have a slight yellow tint to it. The yellow green should be on all the leaves and not just in slpotches. Splotches could mean something else. Since you said dirrect light from 8 till about 11 you will need to just watch the plant. You may need to put up some screen between the plants and the sun, but I doubt it. Just keep that in mind and let the plant tell you what it needs. Thats the important thing. Learn to read the plant.
Now after you move them outside you may find that they are drying out faster thats is good. My plants outside I water once a day, but they are in bright light too. Plus its hot outside. Orchids of that type will benefit from drying out between watering, and the faster you can get it to dry the faster you can water it and susiquently the faster it will grow. Of course there are some species that like to never dry out. Paphs, phrags, and masdis come to mind. But you are safe letting them dry out between watering.
Untill you get used to them growing outside, go down to the supermarket and get some bamboo scewer. The things you use for shiscabobo(sp). Basicly a long tooth pick. When you think its time to water stick that into the center of the pot and see if it comes out damp. If it does hold of watering till the next day and check again. If its dry then water again.
It sounds like you have the fertilizing down. AOS says weekly weakly. 1/4 strength once a week. I know its better to fertilize, but I'm bad about not doing it, and I do it about once a month if that at 1/4 to 1/2 strength and have acceptable results with my orchids.