http://tomatousb.org/tut:using-tomato-s-qos-system
I will give you an example of how to set upload and download speed limits.
Lets say a person with internet has internet speeds of 6 mbps download and 2.5-3 mbps upload.
Download speed = 6 mbps
Upload speed = 1 mbps
You never should set your upload speed limit on qos as your max possible internet speed.
You always want to limit your upload speed to anywhere from 60-85% of your total internet upload speed possible.
As for download speed, it doesn't really matter about setting it under the max amount your internet can handle. Why? Because your upload speed will determine your download speed. For example, if your upload speed is getting way over used by 3 or 4 gamers pvping all day and everyone else is streaming videos non-stop your upload speed will get drained. If you allow this to happen by not setting any upload speed limits in qos, your download speed will drop dramatically. To have download you must have upload first. So upload speed controls the download speed. REMEMBER THAT!
Also, the Asus qos system has never capped download speeds at all. So just leave all that to 100% or you can set them to 0% which means unlimited cap.
It wouldn't really matter if they did, there is no reason to cap download speeds as I was just explaining. The only thing important worth capping in qos is the upload speed. That does work right with their qos system.
All of those traffic categories above work only in terms of latency. So set all gaming consoles to the highest priority and just use all of the default bandwidth values they give. I don't feel like explaining that so just use the default values. None of the traffic priorities even matter if you don't have all of the devices on your network entered into your qos rules.
Keep all of the Highest priority packets set to the default values. I've found from experimentation that this works best with the Asus qos system.