Configuring SQM to reduce Bufferbloat

Thanks for the useful guide. A couple of questions please: 1) I have followed all the steps but I cannot find the nxt_routed_hfsc.qos on the list of options in the Queue setup script on my GL.iNet Brume but I am not sure why that is. Any idea? 2) My internet is via VDSL and so I chose ATM, but do I leave the per packet overhead at 0 or do I change it to 44?

Thanks again for any help.