Neither part of that statement is actually true. At least one of the Madmiral's personalities is completely WAAC.I have no doubt that you play for fun and that you are not deliberately trying to over power your homebrewed dex.



Back on topic....
I have to say that Fandexes at NH just doesn't really fly with me. It's hard enough to keep up with all the different rules out there now (in multiple languages), adding more to the mix just wouldn't help. Especially not in any sort of tourney. The 'fun' second day might be a a chance to actually show-case your work. Kinda like a partcipation game/show case. "Roll up, roll up Do you have the cojones to take on the latest and greatest in Fan dexes?"
It's not really about balance either, it's more about what a player can be reasonably be expected to know and can reasonably expect to face. While I don't have the applicable codices, I have actually heard of the 'the Doom of Malantai', 'Draigo' and 'Wazdakka'. and know they need to be stomped on a.s.a.p. Most folks who play 40K reasonably often, know these kind of things, if not more. That's not really possible with a Fandex.