Hello! I, too, have some endless summers - I planted 7 last spring. I think they may just need a season or 2 to become established. Last year, they probably each averaged 2 blooms - till the end of summer. Right before the first frost killed the flowers, I had about 1-2 on each plant ready to bloom - it figures
! Mine sound like they are in the same position as yours - morning sun, very little in the afternoon. They are about 3-4' tall now, and the leaves are looking great! I *try* to water them every day, but I do forget (and they wilt accordingly!!!). This year, out of all 7 plants, I've had 2 blooms
. But - we had a late frost that killed back about 6" or so of foliage this spring, so I think they are getting a late start this year - at least that is what I hope it is!
As for fertilizing, last year I fertilized once with a 10-10-10. This year, I got some azalea fertilizer - because last year my blooms were all real bright pink, so I thought that might help acidify them, and make them bluer, without having to do much to the soil - I'm lazy! I did throw down a bunch of pine bark mulch as well this spring. Good luck - I'll be waiting to see if anyone has any advice on fertilizing them too!