No. I have never boiled rabbit. It needs to rest after dispatch for a few days or it can be very chewie. One of the reasons grinding works great is you don't need to rest at all.
We tried this with an add on Kitchen Aid grinder and the meat came out very mushy, hardly any shape to it. Do you have any recommendations? Or do you get a better shape from a higher end grinder?
I mostly don't when I grind. I may mix in some if I need it for what I'm making. The Hamburger here are mixed 50/50 with beef so it's not necessary in this recipe, especially with the egg working as a binder.