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Well, the jury is still out, but after making this change thing are behaving much better.

Here: https://ask.openstack.org/en/question/46303/packets-to-vm-are-dropped-in-case-of-multiple-senders/?answer=47686#post-id-47686

I did this on both my physical servers and the sy/si values are now what I believe to be reasonable levels. Running tests now.

What led me to this was I found was extremely variable ping times from the instances to my router. It ranged from a fraction of a ms, to over 100ms. After this change and restarting everything, ping times are now 1ms or less.