I've posted everywhere trying to find someone to tell me what any of this means, but it's all fallen on deaf ears, there seems to be plenty of people with problems but no one with the solutions to them. Here is mine;
Whatever it is causing this it only kicks in an hour-ish of being logged on the server, until then everything is fine. It also only affects me, despite being told it has something to do with "entity spawning packets", this info was given to be after a moddev on the Modded Minecraft Discord took a passing glance at my log file, but it's all the info he could give me.
As for the server and the people who play on it, it has at most four people on, myself who lives in the US, and three friends all in the UK. The server is hosted in the UK, and is running FTB Revelations 2.6.0-1.12.2, and is only a 1 gig server, yes I know the pack "needs" at least four, trust me I know. I'm also running the pack with MultiMC, as I can't bother dealing with the horrible bloat that is Twitch Launcher.
If anyone could tell me what the bloody hell is going on, and why I'm the only one feeling the effects of this, despite the fact that all evidence is pointing to this being a server side and pack issue, it would be great, as I'm loosing my mind trying to figure this out on my own. I can provide anymore needed information on request.