Yes I have tried settings at tiny numbers to see what happens and lately, not much, The articles I've ready on BufferBloat suggest that standard type QoS manipulation will not do the job. What is necessary are specialized algorithms like those of the SQM Lede project to intelligently shape and modify queue. Given such algorithms are in place then making your router the "bottle neck" of internet traffic will allow them to manage the queue, not some buffer out of your control. Here is one such article:
I've been exploring whether or not it would be feasible to put a dedicated SQM only Lede firmware appliance between the Peplink and my switch and let it do its magic. I'll let you know what I find out on this.
In the meantime I've been thinking one approach might be to say let one WAN of Peplink handle all outbound traffic and the other three WANs handle all inbound traffic and see if that would make the internet connection less Bloated. Unfortunately on the Balance 50, at any rate, there is no easy way to balance inbound traffic.
With growing awareness of the strong effects of BufferBloat on internet quality it would seem likely that most router companies will be forced to address this issue, particularly when their routers get an F grade. The DD-WRT and Lede Routers can do this now as can IQRV2 Self-Optimizing router with dual band WiFi (AC1750).
I'm sure if Peplink comes up with a fix on BufferBloat it would give them an edge in sales over competitors such as Mushroom Networks and vice versa.