I've made the bao recipe several times, and have had lukewarm results - always delicious, but I keep finding that my dough is far too dense & way lumpier than in the video, at the point when it comes out of the Kitchenaid to be prepped for proofing. Am I over- or under-kneading the dough at all? Been using the Kitchenaid with dough hook on 2 for the suggested time.