auto strains do stay smaller than the normal version. If it's a 8 or 9 week version it should be ending its life cycle soon. Perhaps flushing till harvest will help.
I am lost in the nutient soup, never grown before so it may be used it wrong.
I'd like to know:
a breakdown of npk ie why have more n in veg or more pk in flower.
what essentials should I look for when shopping.
a safe new guy mix ie a bit less of this or a bit more of that and when
I plan to...
If you increase your cfm you should be able to stay with the same duct. I'm no expert but this is what I've gathered from this forum. anyone chime in if I am wrong. Peace