As Q3 inches to a close, tech stocks have had a rough end to the summer and a rough ride lower in September. But Apple is really the culprit, because of its oversized weighting in broader. Plus, though China has been a key overhang for the market, there are signs beneath the headlines that American companies are still making inroads, as Nike reports tailwinds from Chinese consumers, and Chinese internet regulators propose relaxing rules on data flows abroad.