So does a diff increase hurt any more or less for a low hash rig vs a high hash rig? At first I thought it would hurt less if I had a bunch of machines. But the more I think about it, it would probably hurt the same?
Yes, it impacts all miners equally. Unless you can add more hash power to balance the difficulty, your costs (power) stay the same, but the rewards you get go down (due to the same hashrate producing fewer coins.)