I picked up a do it flapjack mold and a tail mold. I love the idea of the tail mold so I don't have gobs of plastic to remelt but it seems to be causing an issue with air. When I put the tails into the full body mold, 3 or 4 cavities in the middle of the mold aren't filling with plastic. When I open the mold, the bottom and top baits are great but the middle cavities are empty. I was thinking about enlarging the body vent a bit with a small file. If I inject a solid color, the baits come out fine. The tails aren't covering the vent on the side of the bait, only the vent at the tail end. I've tried everything I can think of as far as temperature of the plastic and mold temperature and speed of injection. Have any of you guys had issues with molds not venting air correctly?