Earthworm castings have already been broken down, and provide a lot of nutrition to the plants that is not n-p-k based. Use plenty of this.
Bat guanos are very different from one another, and not all are comparable. Some have been composted, others not. I'd stay around one cup per gallon of soil or less- and then don't add other manure such as chickenshit.
Is there a brand you recommend more then another? Like different companies would have been worm castings then other or is it all the same shit (no pun intended)
nothing wrong with some rice hulls for added drainage :)
In an organic soil setting, sure. That would make a mess in my chowmix.