I made up a bunch of 15# rigger balls today and always have the same prob where ! get a dimple or an air pocket hole on one side. I tried cool, hot, hotter molds and kept the lead at 650-700 deg. I poured slow and got ridges in the tail and poured fast and got bubble holes. I wound up filling the holes with molten lead out of my lee and then filed it down with a rasp. with 10/12# I dont get this problem. Any ideas?