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I have some lead that might have Zinc in it. No matter what temp I cast it at its frosted, all though you can wipe the frost off., and its hard to get the melt to cast good sharp edges on the lube grooves.
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You can test for zinc in your alloy using a common cleaner that has muratic acid in it like toilet bowl cleaner or similar, or if you have a pool then straight muratic acid used for it. Just put a few drops on it in a central area and let it stand for several minutes. If it fizzes or bubbles up you have zinc in your lead. If you see nothing your good.
You might however add in about 6-10" of 95-5 solder to 10# of it and see how that does for you. Sounds like your just a bit deficient in the tin dept there.
Try and keep your pour temp in the 675 - 750 range and you should see the frosting subside.