Am glad you are persistent. That's kinda what it takes to run with cast bullets.
Your mold should be doing well at this point. Most of my new aluminum molds took 50 to 100 bullets before they 'settled down'.
It does look like either your alloy is off or not fluxed well, still too low a temp, or cold mold. I became addicted to using a hot plate for my molds. Once I found the correct temp to set it at, the first bullets out of the mold are good.
Temp can be different for different bullets. I have some that do best running hot (frosted bullets). Others are better at lower temps (no frosting at all). Each of my molds takes a slightly different tempo to keep getting good bullets. FWIW, this is where iron molds are better. Like Verna I learned with an iron mold. Easy peasy. They do not lose heat like Aluminum molds so the tempo is not as important. FYI, the 1 and 2 cavity Lee molds are even more difficult to keep at a consistent temp due to the small block sizes. They also seem to take longer to 'break in'.
I flux with beeswax, just because I have a lot of it, but I also put a layer of sawdust over the top of the melt. Don't know if it helps or not but it makes me feel better
Last, if you haven't done it yet, clean the molds well with something like acetone. I am one who does not do anything to the mold cavities. No smoking, no mold release. I do lube the hinge point of the sprue plate with 2 stroke oil. Just a TINY amount. If you use too much it will wick into the cavities.
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