I had similar issues ( @220 lbs) ..... switching to DT Swiss spokes helped, but did not eliminate the problem. Had my LBS build me a 36 spoke MAVIC CXP33, Ultegra hub, DT spokes, and not problems. A good hand built wheel will always beat a machine built wheel. Cost me ( as I recall) about $150. or so. I live in the Finger Lakes region of NYS- lots of hills, no more worries.