Bufferbloat from ISP "burst"

I think you've discovered the answer: using SQM will solve the bufferbloat, but you don't want to buy a more powerful router to handle your ISP speeds. I offered this advice on another post:

You could ask your ISP to decrease your speed to the point the router can do SQM and see if your gaming improves. You save money both ways: no new router and lower monthly payments. Good luck!