#14 is the best scan result IMHO.
The detail in it is clearer than the 150dpi and the colours are good. Your right about the moire effect (on the pink gloves) not disappearing at low dpi because I think it's actually the chroma effect. It's likely being caused either by a fault in the dot matrix of ink printed to the paper or the inherent texture of the gloves and the dot matrix prevent the scanner from rendering it out correctly.