I've run composite video over RG6 quad sheild previously (currently component (HDTV) over 3 RG6 Quad Sheild) over a distance of about 25 feet. I am using the F connector to RCA adapters you can pick up at Radio Shack. I have had no picture quality issues as long as you have good connections. I run line level audio over RG6 as well.
I would take a guess that your issue is one of the following bad crimps or sub-par cable. I've found that the picture quality is very dependant on how good you are at crimping cable, I picked up a few hundred Thomas & Betts snap and seal connectors with related tools on Ebay and although they were pricey, I don't have any picture quality issues.
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