Meh sorta. I blocked all the arp traffic at the switch that didn't need to pass through the radio and enabled the arp cache within the radios so each could answer the queries themselves and don't need to pass them on so often...and that doesn't work nearly as well as it should. But its improved.
I also gave up on SAF and DF1 HDX. And most recently discovered that the PLX51 from Prosoft has a firmware bug that resets the TCP connection when it confuses TNS. That little bug has been confusing my efforts all along.