Does this prove David Vizard's 128 lsa formula ?

I would agree IF everyone was racing for point and money. Some folks just want to cruise and have a good time in something "peppy" and that kinda testing makes no sense for them. I'd be willing to bet that "they" make up 90% or more of what we're talking about here, too.
Hence the formula, it is the best ballpark for guys running old iron, not shooting for a championship... it's just not the last word's all.