Update: I finally found the perfect cycling shorts: Louis Garneau's Women Zone 3K Shorts. The fabric is very different than other shorts I've seen, it's very soft and stretchy. LG calls it "Alveo 3K" fabric if that means anything to you. The waistband is beyond comfortable and the bottom of the shorts don't ride up. Strongly recommend these shorts and if you wanted to look at them they're sold at Performance. Thanks everyone for your advice!