Of course we're agreeing with each other in different ways, Ron.
But it all comes down to when the aircraft was signed off on. For my gross weight I slapped a happy number down, one that I won't actually ever reach (or at least hope never to).
And all the V speeds are a big unknown at Pink Slip Time. There are some educated guesses, but they're all blank at hour zero.
My point was that once it's established, one shouldn't change the gross weight limits without running into a flag from the FAA refs. Heck, I know a guy with a FlightDesign CTLS that has been known to take off with full fuel tanks, two passengers, and the baggage limit and survived. It's almost like the FlightDesign folks stuck the number 1320 out there just to make the LSA requirements! And "cruise" is a fickle number to begin with. Va and "best cruise" for fuel efficiency are related, but only casually so. The rules for LSA compliant aircraft only say "cruise speed" and so it's firmly in murky water territory.
In many ways, my little Bebe is the reason for LSA rules. She's a big fat ultralight with a 12 gallon fuel tank.