Welcome aboard RCFlyerNYC! I am also using a 91FX and its great, pulls strongly straight up as much as you care to go! 14-8 or 14-6 are ok, personally I prefer the 14-6 or 14-4 because they slow the plane down quickly for landings.

CG's at 4 inches, my manual called for 4 plus or minus 3/8, so I went for the middle. I also have about 1/2 inch elevator throws!! which are not all used for regular flying, but its great to have that extra bit of throw available in a deadstick situation. But like everone said, thumbs lightly on the elevator! After a while it will become second nature to use it correctly. If you have expo by all means use it on the elevator to smoothen out flying around neutral stick!

Good luck with that maiden![8D]