ah, going to disagree with the Dove....guess I wont get access to her convertible now
I prune immediately after flowering....actually just before as flowers fade. I remove all flowered wood and then go further into green wood. It keeps plant compact and more floriferous for next year.
When I get a new broom I try to buy small and prune back reasonably hard. Then out of flower it still looks a good evergreen mound
in your case biofreak, remove those seed heads asap and just into green wood but not as hard as I would have done since your bushes were not pruned last year. Do not enter into old wood....your broom will prob die if you do