Rob. the buttery flys you refer to, also act as a choke on cold days.
I have my plates removed, and the thing I noticed the most, is a hesitation on take off, until the engine gets good and warmed up.
The reaon you don't really see them move, is because I think they are electric/vacuum operated.
If you decide to remove them, simply remove the screws,( with a magnetic screw driver, so not to drop the small screws down the throttle body) holding the plates to the shaft.
This problably will not help your situation. But I have a TFI fuel controller, which has 5 pods, set at 5-4-4-4.
In setting mine, I started on the low side, took it for a ride, then set it midway, than set it on the high side, taking note of any changes in sound/popping and acceleration. This gave me reference points in making my adjustments.
I also have XXX BAK and Freedom Sharp Curves and have very little to no decel popping. When and if it pops, it is not very loud.
Somewhere in this forum I posted pics of my plugs after running them around 15,000 miles with the above setup at 4.5-4.5-3-4. They indicated an ever so slight lean mixture, so I made an even more slight adjustment..
a little rich is better then a little lean. IMO
found the pics