You will get more responses in cat general, if you want to repost your situation there. Vacuuming constantly is just one of the "joys" of having pets that shed. I have to vacuum every day with Finn, especially right now, he sheds like crazy! And, I have had multiple cats before, and, did the same thing. Brushing them every single day, even if it's just for a couple of minutes, will cut back on a lot of the shedding. Even if you just get one of those mits that goes over your hand, every little bit helps. I think grooming daily is your best bet, though, really.