JasonTaylor,
Did you make sure that when you installed the upgrade that you went back and performed the Hybrid Balance and Loop Loss Tests? Also you can go into the individual trunk and set the gain on the transmit and receive sides up and down, it is best to do it by + or -3 db. I normally find that the transmit side is the one I have to pad more than the receive side, but that is based on when the issue comes in for the user and whether or not the person they are talking to hears it.
Thanks,
TE