This is why I use a dremmel at home. Does better rounding the edges, less blood if you do accidentally go too deep, they aren't exposed to the stress a d potential infection of the vet, and I can do it as often as needed without breaking the bank.
Also, plastic perches could likely be part of the problem. Pedi perches that are smooth on top but are flat so the nails actually hit the rough surface are great. I also wedge my cuttle bone through the bars and they love to perch on it while they chew, and that seems to do wonders for their nails as well
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Cockatiels:Battle, Sniper, Jackie, Honi
Blue Headed Pionus: Mel
Green Cheeked Conures: Flick, Cache, Titan
Indian Ringeck Parakeets: Blue, Kamehameha, Ka'iulani, Kahili, Shadow, Ali'i, Noni, Pono, Smokey, Hapu'u