We were using a pretty similar setup at CIR too - dual mjpg streamers running to smartdashboard. Never saw any issues related to coms on the field. Some crucial differences: We stuck with the default ports of 5800 and 5801, did not see any issues. We addressed our rio with the roboRIO-1736-FRC.local address. Our streamers were hosted on the RIO itself, not a coprocessor. Additionally, we had made some modifications to that same smartdashboard plugin to allow it to stream from either feed and only display one, depending on which direction we were driving. Finally, we had generic wide-angle
cameras, not the Logitech ones you had.
I'll try to keep you posted if we run into any issues - next field we'll be on will be at Midwest. The non-reproducible problems are always the worst to try to solve...