8.1.5 and back hauls

I had some new backhauls come in with version 8.1.5, this link used to be solid however how it has horrible latency. Are there known problems with 8.1.5 and back hauls or should i upgrade to 8.2.1? whats the recommended firmware for these backhauls?

Jitter of 2
link test show 98 downlink to 100 downlink
up link 100 both ways

use 8.2.1 according to motorola