I an not sure you will get the action you want with a flat sided bail ( I am about to start my own design thread)and I am just guessing but it looks like you are printing 2 halves and gluing everything inside. For my stuff I have been avoiding 2 part baits like the plague. With my lures what I try to end up with is a 3d printed equivalent hand carved lure blank. This shows the idea reasonably, this lure was printed belly up. the wire harness is a slot filled with CA glue and baking soda the ballast are two 00 buck lead shot. I have used steel slingshot ammo too. The back does take some sanding but a layer of CA glue and some sanding get rid of most of the layer lines and marks from the supports.
I have used both thru wire and wire twist eyes and twist eyes seem to stand up to the pike I fish. So for now they are my default.
% infill is another tool that is really useful for floater divers I just use 10% double line infill. With sinking lure I use at least 35%. With my whitefish project I am planning to print it so it it has the density as if I had made it from maple.