Been shooting a solid body jig with 5 leg tail..for some reason lately when i shoot it not all of the body cavaties fill up. Its like i get a big air bubble...my plastic is heated to 345 plus i inject it into mold til i cant shoot anymore due to plastic solidifying in nozzle i keep sprue full doesnt seem to matter if i shoot it fast or at a slower pace. Any ideas on what im doibg wrobg or whats happened?