May I make a few suggestions?
QoS makes a rather striking difference to your network's zippity-doodah. As I've learned from my flight lessons, you often forget steps required in a procedure unless you follow the checklist religiously, so refer to the checklist religiously and things go as they're supposed to.
First, please go back and re-read post #2 of this thread, and then post #1. Print them out so you don't have to switch between tabs in a browser when you're tweaking, and highlight sections that you might tend to gloss over.
Second, please realize that it's quite unlikely your connection consistently achieves the speeds you pay your ISP for. Your jpg1 indicates that you have one of the speeds set at 1000Mbps, and your jpg3 shows a high of 850-something (IIRC, which is probably a realistic, if not average, speed); re-reading post #2 should show you that your settings should take into account these actual results. (IE- set your up/down limits at 770-780-790/850-860, save and restart -that means turning QoS off when you make changes, then turning it back on after adjusting them/saving - the saving part is what people overlook/forget most often - and then maybe even reboot the whole shebang, possibly including your modem, to give everything a little kick in their backsides: If there's some sort of logic problem or conflict from tweaking things, it usually gets sorted with a reboot)