Nice baits, that olive darter pattern is nice.  Good observation on the epoxy.  It’s good to figure things out for yourself.  You often hear on here that too much etex will weigh down a bait.  It's technically true that epoxy adds weight.  What people are not realizing is that epoxy has a specific gravity of nearly 1.  That means it’s neutrally buoyant in water and does not add weight that will cause the bait to sink.  Adding epoxy will increase the size dimensionally and therefore its volume.  So, if you have a lure that’s already neutrally buoyant and increase its volume, what’s going to happen?