Perhaps the answer will be to always let the engine idle ten minutes before shutting it down after any "spirited" ride, to allow all that excess oil collecting in the engine to drain down into the sump and be returned to the oil tank/pan? Only semi-facetious, and I'm sorry to hear about this latest failure Alan.
I wonder if Harley has done any testing to determine if perhaps way too much oil is being delivered to the heads and like the early Twin Cam prototypes the oil isn't draining down fast enough. On those engines the excess oil was overwhelming the breather system, and the "fix" was to limit the amount of oil going to the heads. That problem is what delayed the launch of the Twin Cam btw. Thinking about the circumstances in this latest case, the engine was running fine until it was shut down and allowed to sit, then when started some time later it was immediately apparent there was a problem. All that oil had to come from somewhere, and the only way I know of for that oil level in the sump to rise while the engine isn't running is due to the oil draining down from the heads.
Jerry