XR1000 QOS for gigabit

See that’s the thing. Even when I have QOS set to never and I test speeds. I get fluctuating speeds almost every test. No test consistent to one or the other so it’s hard for me to choose a set speed. My download speeds are inconsistent but my upload speed is always a consistent 40 to 41. If my download speeds are fluctuating. Should I set the speed to like 900 if I’m getting 860-947 numbers and in between with every speed test taken. I believe I should set my upload to 41 as it’s the rough average. I watched freethys info on duma os and he said to set the QOS speeds to your worst time of the day internet speeds. I’ve tried all numbers but yet I still get jitter spikes. I just believe I’m doing something wrong for my set up. I run a CM2050V Netgear modem and use my xr1000 for internet access.

And another reason why I use QOS despite the fact I have gigabit download speed is because I have so many devices on my internet which gives me lots of bufferbloat and it hinders my online gaming experience. Almost makes it aggravating to even play or enjoy gaming.