Being serious here, when you raced that 5100 at wkpoors gtg you beat it with a time of 4.75, that 5100 ran it in a time of 4.87 in 8x8 2 cuts, and it was done with a guy that never ran that saw before, until that race. Now I've run the saw quite a bit cutting firewood, so I have a good feeling for the saw better than one that has never touched it... Maybe you were out chained maybe you weren't we'll never know.
But I do know I was running a stock carb with airfilter plus the horrible rev limiter, you had advantages too. I find it hard to believe that with you having a square grinder that you didn't have a very sharp chain also.
I know these GTG's are fun and I want to keep it that way, the 5100 is not a all out race saw. As the builder told me "It's not a barn burner, just a good woods ported saw"
It's obvious that your 260 and 346 and my 5100 are very close to each other, and it's kinda fun that way