My DD has a peanut allergy as well as eggs and tomatoes. I know the feeling about feeling obnoxious. I always thought those allergy kid moms were so bossy and militant... now I know why.
RAST numbers can go up and down and they don't know why. I agree with Bluebear avoidance is your best bet to not increase his sensitivity to peanuts.
I was thinking about why so many people have food allergies these days. 50 years ago hardly anyone did. People aren't that different than 50 years ago so it must be the food.
Good luck with your DS. It's good that he understands the importance of what he eats and touches. He's a smart one!