What you can do, gather up all the other PCs that use this program, assign them a reserved IP address range, all in numerical sequence, i.e. .100, 102, 103, 104, etc. When you have done that, then create a QoS rule, Input the first local IP address in the FROM box. Next, input the last IP address in the range, 104. So every PC between 100 to 104 or what ever is the last IP address, will be included and covered in this rule. Set the protocol to Any, Priority to 255. Local and Remote ports input 0 and 65535. Remote IP addresses should be already filled in and grayed out. Save the settings.
Now if you want to great a rule specifically for your gaming device, create a separate rule for just the one device. You can use the same protocol however set the priority to a higher value, try 50-100 at first. You could set for 1 however you might starve bandwidth to others so test 50 to 100 first then adjust upwards from there.
Let us know how that works out.