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QoS also weights connections. In other words BT will allow as many connections as you have configured. If you set the QoS for BT to be like 125, then each of the connections it makes will be rated there. This can bog the NAT and cause it to see like QoS isn't working. I suggest BT be QoS'd at 255.
Correct me if I am wrong though...by setting my gaming PC to priority 1 and the wireless pc's to 255, I should effectively hogg pretty much all the bandwidth and choking the hell of of theirs. My question is why isn' this working?