What's in your potting soil and did you source the garden soil from your garden or is it bagged?
Not that it isn't possible, but it's hard to over fertilize cannabis plants outside with organic amendments. I have no experience with manures, so someone will have to answer that one.
With castings (indoors) I use them at 1/3 rate of the whole. The bone meal should have instructions for how much per cubic foot, find that and I can help you with the math. Not all bone meals are created equally npk wise. Your peat Moss would serve more as a host for microbes to grow on since you're outdoors and don't need it to act as a base for your soil mix. Break up your egg shells as fine as possible, think powdered, and sprinkle it at anywhere from a fourth cup per cubic foot up to a couple cups per cubic foot, depending how much you have available. Egg shells take a while to break down and would take massive amounts in a bio available form to do damage. I suggest sprinkling some on top of your soil as the shells are a good way to protect from soft bodied insects.