That's completly counter intuitive IMO. You see fatigue at all levels during play, some of which is indistputabily from the labor of stroke production. If your raquet is 10-20% heavier (which is the spread we're talking about) and you do hundreds or a thousand plus strokes per match near maximum effort while running frequently during play, IT MAKES A DIFFERENCE.
Sorry but no. Even in seniors (60 yrs plus), you'd be hard pressed to find experienced players who's match fatigue stems (or would stem) from a slight increase in stroke production effort. Even if we use a racquet 10-20% heavier, that will translate into a much smaller percentage increase in stroke production energy overall...I'd guess about 1 or 2%. In any case, the demands of bending, running, stopping, starting, lunging are far more of a factor. This is true at all levels...often amateur players aren't swinging all that hard relatively anyways, but pro players are so efficient and relatively effortless, that it might be a bit of a wash.
Again, a bit of forearm or wrist fatigue could happen, when one first adjusts to a heavier racquet...that's about it. And it will go away shortly....of course this scenario doesn't happen at all at the pro level.
I really don't think this is even that non-intuitive for the non-player/athlete. Do you think that if Federer or Roddick or Nadal, took some lead tape of their racquet that suddenly they'd be fitter in 5 set matches? Serve harder in the 5th? Actually, I'd argue that if we want to take a couple oz. and make the most impact, the best place to put it would probably on a players shoes. You take one hell of a lot more steps for every swing you take! But of course, for pro players, even a couple of extra oz. in the shoes isn't going to be a huge factor.
Again, to repeat: most fit players don't even lose much serve speed over the match, and, when they do it's usually the result of general fatigue which is not caused by a heavy racquet but by the running/stopping/starting they have had to do. If you don't think so...well I suppose there's nothing else to say.
Certainly we see that baseball pitchers also lose very little speed of their fastballs, though I often wonder if those that do, do so due to micro-injuries incurred during the game. Certainly this seems to be a factor in baseball....there have also been some theories floated as to why it may be different from a tennis serve in this manner, but nothing conclusive that I know of.
PS.I'll also mention, I"m not sure your conclusion even makes sense to me in that:
"For racquets of similar weight, the ACOR of graphite clearly allows more energy transfer to the ball. As I mentioned upstream, the mass required of a wooden racket to "keep up" eventually limits how long you could exert max effort to bring it thru the contact zone."
If we assumed that max efforts were being used for both racquet weights, then why do you assume only the heavier racquet will illicit sub-maximal efforts? I've been assuming you mean sub-maximal speed...
