I think it depends on what you mean by “poke holes”. Most amateurs seem to attempt to debunk mainstream theories based on a fundamental lack of understanding of the very theory they seek to debunk. I would start by creating a topic and asking a few simple questions about whatever aspect(s) of mainstream theory you are unable to reconcile. Then after you read the replies, do the research, read the reference material, evaluate the observational/test data, etc. - if you find any inconsistencies, then you could ask more advanced and educated questions and progress from there.

The moderators probably see it as a vacation. They must grow weary of teaching physics 1.a repeatedly to people who seem incapable of understanding it, let alone appreciating all the time that goes into maintaining the integrity of information made available on this esteemed forum.