Hi Rodders, thanks for the compliments on behalf of all.
Tweaking the rudder settings under Hardware-Input and adjusting the profile sliders can be a bit difficult. Most of the time it's a good idea to start the first (left = venter) couple of sliders near or even onzero settings. IL-2 Joycontrol and IL-2 Stickscan be very helpfull when tuning your joystick (both available from
http://www.mission4today.com in the Downloads section. Be aware that different planes might need different profiles, and only keep the right most slider at 100% - that's a setting that is hardly used, unless you want to loose huge amounts of energy and end up in a flat spin

Do you have this problem especially when taxiing on the ground or is it in the air only? Check if the signals the rudder is giving to the game are what you expect (IL-2 JoyControl has feedback "dots"like in the game input section.
When approaching your target, set Icons on and keep an eye on distance. when getting close try to get to the same speed (distance keeps the same) and then "creap up"slowly.
Catching up with a plane for formation flying can be a bit tricky, especially when it's an AI plane you try to catch up with. Make sure your plane is trimmed right for your altitude and speed, don't take 100% fuel but only what you think you'll need and try to catch up speed by slightly diving toward where you want to meet the target It can take a while to learn, but it can be done. IL-2 Silver Triggers' ST_Pawnee posted a great aerobatics pair close-formation flying movie (think centimeters, not meters) he did with his squadmate some years back - really amazing to watch.
here's the original thread I don't know if it can still be found on the web. If I find it I'll report back with a link. It's call "Hot Pair Aerobatics"IIRC
Maybe it can still be found on
Flightsimmachinima