Mbasko - my settings. Deep (shallow is just too noisy), fixed, discriminator off (90% of the time), both channels, threashold just humming. I used to ground balance frequently just to keep the 2200 on its toes. I also ran the 7.2v battery set-up. After you get used to the 14", try (hire or borrow) a 18" DD for deep ground and patch hunting. Then you will notice the 2200 runs like a dream and gets little noise. It is still deadly on smaller pieces close to the surface. I have a very experienced friend who did very well with the 2200 in the early days with an 14" and 18" DD and he swears they are the optimum coils for the 2200.
You running an audio booster on the 2200? Probably not a bad idea as they can give it a bit of an edge. They are a lovely machine and me and my detecting mates that have GPXs have kept their 2200s as well. I will admit that starting the 2200 up versus a GPX is two different worlds. the GPXs are bang - away you go - the 2200 fxrts, splutters and takes its own good time to get going, as does the user. My grandson runs my 2200 now after learning on a VLF - he loves how 'quiet' the PIs are in comparison.
Good luck mate -I am sure you will do well.