Hey sufiness, good to hear that your birds are now flying for an hour.
With high fliers you have to toss them, most high fliers wont just fly by themselves unless they get scared off the roof, so just carry the birds outside and toss them, soon they will all climb to the skies.
You also say that they tumble, are these high fliers, or tumblers? I have no experience with Iranian highfliers or tumblers, but if you have an idea of how long they are supposed to fly, you can change your training methods a little to achieve that result.
Here is what I do with pakistani high fliers:
Let them sit in the aviary for about a week or two. Then settle them to the loft in a cage for a day or two making sure they come inside when I call them. Then I remove the cage, and they now venture out exploring the loft roof, soon they will start flapping their wings and might take off. Usually they just fly a round or two and land back on the roof. Once they are settled, I start tossing them, they will now climb higher and fly longer for each time they are outside. I fly them every day for about a week, now they are usually flying between 1-3 hours. Once they reach that mark, I fly them on alternative days, that usually make each bird increase its time with about an hour or two. The more you fly the young birds, the more they will fly, and when flying on alternative day they get some rest, and will fly longer on their next training.
As for droppers, I never tried. I know that tippler fanciers train their birds to drop when they signal them, but I dont. I let them fly as long as they want, and since my birds are solo fliers, some might fly an hour, while others might do 10 hours, its all up to them, and how much they wanna fly on a given day.