From what I have read anything sub 70k jitter is fine with ethernet cards. So if you are clocking comfortably under 50k on jitter I would have thought you would be fine.
The next think to check is you ping time from the machine to the ethernet mesa card. If you are on intel or realtec nics it should be pretty good. Broadcom is a problem. You have to work hard to tune that to perform with a tight enough network latency.
