So I've bought 2 pair sp far and neither are working for me.
I purchased a "one size fits all" that was in my measurements, but they barely came over my knee and seriously muffin topped me. they also roll down like mad, but I don't mind wearing a garter. but the muffin is too ugly.

so I bought another pair, this time in plus size, and the measurements were well within reason. However, these are also not as high as I want them :/ and the roll like mad. little less muffin, but it's still there.

I'm about to give up! I see girls with bigger thighs than mine that have ones way up on their thighs with no muffin. where are these!

I find the stay up ones to have the same issues you stated. So when I find them I stock up on the old fashioned silk ones that don't have the elastic to stay up, and just use a garter.