[snuffy]

Several things;

As stated by others, you are too cool in either lead temp or mold temp. Also I see a lot of dirt in the metal on the sides of the right boolit. I'd say you need to flux the heck outa that metal. Use wax of some sort, AND stir the pot with a wooden stick, making sure you scrape the sides and bottom of the pot. That dislodges dirt from the bottom and sides where the molten lead is holding it. I bet you melted those wheelweights in the same pot you're casting from!?

The bases look like that because you didn't get the sprue plate clean. Lee uses a water soluble oil to cool the cutters that make the mold and sprue plate. That stuff is very difficult to remove. DON'T use carburetor cleaner, it contains oil. You're trying to get rid of oil! Take a pot, fill it so you submerge the entire mold, use a dish washing detergent. Turn the heat on to boil the water, let it boil for 10-15 minutes. The heat and soap will get rid of the coolant oils.

I seldom smoke any of my molds. I know lee says to do that, I don't feel it's needed. I like the clean crisp lines on the boolit, smoking seems to make things sort of rounded.

WW need some more tin than they contain. You want AT LEAST 2% tin, WW have less than 1%. That alone will help. If you buy lead-free solder, make sure it contains 95% tin and 5% antimony, not tin and copper, or silver.