SouthernGypsy

That's definitely helpful for troubleshooting purposes, in terms of feature offerings though they are on the same level. The only difference between the two is the CPU I believe but they're the same speed 

Well the thing is what I really want to do is to deny that entire location, BUT want to still allow players and other things in the general area. Instead of dragging this topic into another toppic I made another dedicated post where I explain it more in depth so it will make sense at;
 
 

OP, I have the XR1000 but have the exact same results/issue as you. Recently our ISP upgraded us to Fiber 1Gb both download and upload and now I get high pings on loaded up/down test in the router and on websites like the buffer-bloat page you posted.  I don't mess with the "flower" as it just seems confusing (if not bugged) but I have messed with the sliders at the top and though they say 70% is usually a good place to start for gaming after a bunch of testing I have found the best settings for mine is all the way down to 23% on download and 42% on upload in order to get good results ...which seems ridiculously low to me, with the down/up set to 1Gb that's only giving me 230 down and 420 up.  My base ping is 14-15ms with a 0.07% jitter (both good) and while I don't get the full 1,000Mbps up/down (usually in the 900s) and the baselines are always very stable. There is no way my network is "saturated" or anywhere near it, If I go to the network monitor page I have never seen the total usage above 20-30Mbps total (all devices combined) and that's only when I'm streaming a 4K UHD movie. On the connection benchmark page my Speed and Ping are always A+ but the Ping Under Load is always a D, unless I turn on the QoS and have the sliders set as I mentioned above at 23% down/42% up.  I have done a full long process reset, reinstalled the firmware, everything. Nothing changes this one problem that I have found...
It's honestly starting to make me wonder if this "Gaming Router" and it's DumaOS is actually designed to handle 1Gb connections. I never had the problem until our ISP bumped us up to the 1Gb speeds, we used to be 50 Mbps down/15 Mbps up and the network wasn't saturated then and we always had A+ on all three categories, we get 1 Gb fiber and now we have speed but the buffer-bloat kicks in and our loaded speeds jump up to 80-120ms on the Ping Under Load section.