I think the feed sounds pretty okay, as long as the protein composition is in balance. Can you find a breakup of the proteins for that feed somewhere? Methionine is usually the tricky one to get balanced. 17% sounds a bit high, I'd stay at 15%-16%, slightly higher during molt and of course younger birds require slightly higher protein. To me, all of those breeds sound like late bloomers too, and taking into account the fact that they have only been about 3-4 months old when the days started getting shorter there, you might still be waiting a while for the eggs. Additional lighting is the trick, as mentioned before, about 14 hours of light per day should work. Just know that if you trick them into laying with added light, you're also shortening their lifespan, or at least the time that they'll be productive.
Pullets are hatched with all of the ova that they are capable producing in their lifetime. By increasing the daylight hours you are simply not allowing them to ' winter down '.it won't alter the amount of eggs that any one hen lays.
http://www.the-chicken-chick.com/2011/09/supplemental-light-in-coop-why-how.html