By pruning them frequently you are actually encouraging new strong growth. You should leave all the long whippy shoots alone until about now(or the next week or two), and then prune them back to about 5 buds. Prune them again back to one or two buds in January and get the flowers.
If there are any long shoots near ground level, instead of pruning them try pegging them down for layerings - it can take a couple of years for them to root but it does work in the end.