The Devcon 2 ton may be your problem on these larger baits. It has a fast set up time and the brush may be dragging and pooling up a skim of partially dried epoxy in spots. I would suggest cleaning your baits with denatured alcohol and trying a long set epoxy such as Envirotex. Let it stand for 10 minutes after mixing to help reduce any bubbles. Blowing on it also pops bubbles as the carbon dioxide in your breath helps them rise to the surface.