For Gae Bolg, pretty sure that it would take almost more prana than he's got to use the throwing function, the only thing he should get is the heart stab, and even that should be hard on him. I was more thinking he could just use it as a spear, without invoking the spear's functions.
Also, there's no need to use overedge as a charge shot, just make it so the charge shot is him throwing them.