This all reminds me of a story from the days of Air Warrior. Way back when, AW ran on 4 different platforms - Mac, Atari ST, Amiga, and the PC. A version was released and all of a sudden Amiga FW's were handling better that anyone else's Spitfires. You could tell in one turn if the FW you were up against was an Amiga it was so pronounced.
Kesmai checked and re-checked their data and swore on a flock of sheep that the data feeding all four versions was identical. Finally, mercifully, months later, they found the "non existant" problem. They had a logic error in calculating the weight of fuel - it was inverted on the Amiga front end code. So a fully loaded Fw on an Amiga weighed that it weighed dry *minus* the weight of fuel.
So even if the data is right sometimes something else gets changed - sometimes by accident - which messes things up. I ain't saying that has happened here, but as a very wise man once told me: "Different things vary."
As for the low-speed handling on all the LW planes, it's not that I expect them to turn better; I just wish they didn't try to flip over at the slightest pull of the stick if I'm under 150. It just seems odd that 3 very different planes (109, 110, 190) all from the same country exhibit the exact same weird flight characteristic. Of course, I rarely fly the German planes (largely because of this) so maybe with more practice I could compensate. Dunno - just seems bizzah.