[ That might be the case when conditions warrant 12 plus pounds wingloading. However, even the I believe, September Jonkers newsletter, told of a week day at the world championships when they went from four JS3's in the top 5 slots to one JS3 in the 5 top slots.[/quote]

Actually that "bad day" was not that weak, and for the JS3's was more about the fact that they flew a different track/time and had zero lift on the last leg to get them home. More bad luck with respect to timing than to do with glider performance.
Both are superb sailplanes.