| Glenn,
I normally find it's a long fingernail that's causing unwanted noise from the right hand. Make sure they're nicely clipped at all times and make sure your finger tips are hard.
Also, if you find you're digging in too hard with the right hand that means there are some inconsistances with your technique and you may want to take the time to be concious of that when you're practicing.
The studio is an artform in itself. everything is exposed and you are really under the microscope when you set foot in the door and press record.
The best way to become consistent with your sound in the studio is to record as much as you can, and to keep your ears and eyes open while you're on the record date. Soak up everythign you can. talk to the engineers, producers, ask questions, and get as much out of each date for future dates that you can. A change of strings and a good set up can be a great thing a few days before an important record date too.
I was fortunate this week to be in rehearsals all day every day, and could time the string change just right to hit the studio one night and be in perfect playing condition for a record date. I changed them the morning of the session, did a 7 hour rehearsal on them, and then hit the studio right after the rehearsal to record. The strings were perfect, and the album came out sounding great.
There are just a lot of little things to take into account for the bigger picture down the road. i.e. the finished product of an album or some sort of recording. the more you prepare for it and the more aware you are of your surroundings the better.
Easy,
Janek | 
