Best case would be your router/modem dropping/ECNing packets to keep below that cap, which would fix the "multiple computers" issue. You've still got the proble

Best case would be your router/modem dropping/ECNing packets to keep below that cap, which would fix the "multiple computers" issue. You've still got the problem of buffering in your ISP's network screwing you up if it can't handle the rate you're requesting (as well as not being able to take advantage of the extra speed when it's less congested), but there's really nothing you can do on your end about that. Yes, hard-capping your outbound traffic would help, but it's not a "solution" by any means.