So you only have a palette and a duo by which you judge the entire line? Were you planning to mention which palette and which duo? There are shades in the line (in every line) that are formulated to be sheer, matte, sparkly, shimmery, metallic, etc. Perhaps you're expecting the wrong results with the shades you have selected.
I think you should eliminate either the UDPP or the Paint pot and try again. I'm not sure why you would need two bases anyway. If eyeshadow doesn't stay on long enough without them, I would just reapply at some point during the day. Honestly, in 30 years of wearing makeup, I have found so few "chalky and unblendable" eyeshadows outside of the drugstore that I tend to chalk up comments like this to user error and not to the products themselves. (sorry for the pun, couldn't resist
) Having UDPP AND Paint Pot underneath can make it more difficult to apply and blend than if you had neither. If the UDPP/Paint pot combo is the least bit tacky then it's going to make the shadow less blendable. Which of course, has nothing to do with the NARS eyeshadow.