well i got both servers running in about an hour and logged in to the 2.5 with my client.
i was not on a single block with a tree but all mods were there and working.
with the same client it would not load the 3.0.6 and errored out so without the client i could not log in to the server but from the logs/latest log page in the WebUI type /help returns 22 pages indicating all mods are loaded.
i’ll be AFK for a while. then troubleshoot my client
good luck!
tNt