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I've been wondering this for a while but I haven't got around to making my 2 element yet.  I was planning to hairpin match it too, but I never thought of there not being a low enough impedance to do it until reading this thread.  Did you measure the feed point impedance with the original boom dimensions?  If you can shorten the driven element enough to make the feed point conductance cross the 0.02 S line, you can hairpin match it to 50+j0.