Baker
My reference to "a more modern airfoil" was that I thought you were using the current United wing, which I believe is Patternmaster based. Yes, the United and the Sabre share the same foil, I remember. But to this day, I still think the Sabre flew much better than the United,(the OS Max 35 version). I saw them both fly.
Specifically, to my eyes,(they were very young then LOL) the Sabre seemed to track much better,(like it was on rails) and came out of corners much harder and flatter. This last characteristic was the most noticeable difference and gave the plane a spectacular, almost unbeatable appearance through the pattern.
Needless to say, only Bob can really tell us just what was up back in 69,(has it really been that long) between the two ships but, if I am not mistaken, the Sabre racked up 11 straight wins prior to it's win at the 1969 Nats at the hands of a certain "Mr. Champione".