Interesting thread. I have used LEE molds for many years. There are many how-to articles on the net, so I can only say that having them clean is important. I mostly used straight WW, but sometimes add a bit of lino. I have never had any leading in my rifles and only one revolver, a 44 mag. I gas check everything that allows it. I realize that might not be necessary, but have a good supply. I mostly cast .38, 9mm, .429, .452, .308/9, and 8mm/.323.
It is popular with some to slag LEE molds, so have your salt shaker handy. I use straight LEE Liquid Alox, but will smear on a bit of blue lube with my fingers if the bullets are to be used in a bit hotter load. Again, never had leading in my rifles.