[Graflex45]

I'm trying to get a definitive answer to the issue of using stainless fasteners on attachments, particularly mower decks.
I've restored 3 over the past 4 years, disassembled a 4th for parts to use and stripped down and restored a tiller. I have become set on using stainless steel bolts where I can, and modifying the sheet metal to use carrige bolts where possible on the decks to keep cluppings and crud from building up. And I'm now restoring a non-cub deck and doing the same on another tractor.
Is using lower grade stainless fasteners with carbon steel really a bad idea? I smear anti-sieze under the fasteners and then on the thread. I have even disassembled a deck i replaced the fasteners on 3 years ago to get painted and the area doesnt show any pitting underneath and plenty of compound was still under it. same with cleaning up one of the decks for my 70 before it gets used this year.