I wrote a tutorial on using tncg finally. But, I’m finding file sharing traffic does not like to be classified by port and tcng is not equipped to deal with that. It also seems to have some issues matching IP packets based on length, which I need to prevent the inclusion of packets with huge payloads in the TCP ACK class.
Instead, it appears to be time for Netfilter with some experimental extensions and some classic usage of the tc command to define shaping.