Waltorious: Try changing the joysticktype setting in your configuration file. Common settings include 2axis and fcs. See if one of those fixes it.
imac12: Ran through all of the joystick types, trying timed=true/false for each. No change. Timed=true actually makes the drift stutter instead of a constant, but it's still not playable for me. Tried unplugging the unused HOTAS throttle and that didn't change anything either.
Totally baffled here. At this point I'm just chocking it up to old vs. new compatibility stuff, but it seems as if others are using similar setups without issue, so I really am at a loss.
Very strange.
By the way, have you tried mapping the throttle using Target?
From what I hear it has the same functionalities of the CH Products control manager, you should be able to map the speed presets to the throttle, there isn't even a need to "merge" the two peripherals as the throttle should essentially send keyboard strokes to the game.