Thanks for helping, Matt, but:
There is, in fact, a sensitivity control for throttle in FS9 Settings- you can scroll down that window to get at it. Adjusting that does NOTHING for me . Zippo. Nada.
And as I said, keyboard commands yield the same (crappy and unworkable) result.
This program you mention could be the fix, but I'd love to know why the heck I have to now add another app to interface with FS9 to fix something that used to work just fine...I know computers are basically evil

, but it still makes me think that would be the wrong kind of fix. In short, I feel I need to start at the point where things first went wrong... I'd find the answer there, right?
Eh well, back to the old drawing board...