Dolphin's BBA emulation is really slow under Windows, so it's possible that it simply can't keep up with a game that expects < 1ms latency for proper operation. I'm not aware of anybody who has gotten the LAN games to work well with Dolphin, at least under Windows. Linux BBA performance is supposedly better, but I haven't tested it. Sadly, the one developer who recently showed interest in trying to improve BBA emulation under Windows threw in the towel.
