Messages

Only thing that pops out to me is this rule:
    Sequence=1
    Interface=WAN
    Proto=tcp (ACK packets only)
    Source=any
    Src-port=any
    Destination=any
    Dst-port=any
    Direction=out
    Target=ACK
    Description=TCP ACK priority
It will include both uplink and downlink TCP ACK packets. You might want to consider using a similar source/destination address filter as your Uplink rule.