G940 user here too, but only the stick. I did not like the rudders (went back to saitek as I prefer the wider stance and throw), and went back to my X52 pro throttle for CoD.
I'm a bit of a 'hoarder' of sticks and have a CH Fighterstick, Combat stick, modded Cougar and MSFFB2.......I prefer the G940 stick over all of them. In terms of precision (most important to me) it is at least equal if not better than them all IMO.
Make sure as mentioned you have the latest firmware update. MikkOwl is worth getting in touch with too, clever lad who knows his beans. Just do a forum search then PM him, I'm sure he'll help you out he's a good guy.
Though I love the stick, I don't think I could in good conscience recommend the package overall at full price, especially with only a 1 year warranty. I got a good deal through Dabs UK which gave me an 'extended' 2 year warranty. I would not have bought it otherwise given the Logitech rep for breaking swiftly. After seven months of use, the throttle 'rotary spiking' issue surfaced (very common), but I got a swift replacement.
If the rotary spike issue happens post warranty, there is a very easy fix involving the small movement of a data cable. If I can do it in 15 mins, then so can you.
I'll try to dig out a thread explaining how when I have time, but its very easy. Not that you should have to do it anyway, its a design flaw, but still.
A year and a half on, the stick is still fine *fingers crossed*, and I use settings very similar to Dutch.....everybody is different however of course. the key is 'Spring effect strength' as I remember, for stiffness/looseness ( I disable centering in the control panel like in IL-2, but there is still centering present).
I am hoping that 1C allow for the changing of the autocannon confi setting, as I find the 109 cannons to be too overwhelming (as well as unrealistic) which can make aiming a pain. In IL-2, you could remove the effect altogether (by either renaming the file or removing it) but I have not been able to do so in CoD. Please fix devs.
I also have an issue where there is no FFB present at the start of a mission, until I move the stick around for a while through its range of motion, then it 'kicks in'. Anyone else get this? If so, please fix this too devs, I doubt I'm the only one.
Cheers.