Know what you mean, I've ben involved with commercial aviation for many years, and the same thing happens, new bits break, new repairs keep on coming. To illustrate the point about the old ones, the image is of TVAL's Fokkers, you can see the 'S&L' attitude of the D-7 and D-8, and the amount of elevator held. No doubt the pilots would consider the airplanes 'tail heavy' but we modellers know that it is not the case, you couldn't fly it if it was, but they really did need some sort of pilot operated tail trim device...
Evan, WB #12.