Two good recommendations here: leave it alone as E is valuable, or reface it larger. I can see value in both sides. The value in the enlarging the E rather than getting a C* and enlarging it is due to the fact that since the E is already larger, bringing it to a G can be done without having TOO MUCH baffle material. if you start with a C and take it to G you will have an excess of material in the baffle area. The piece will be overly bright and shrill if that baffle material is not removed. Unfortunately, removing that much baffle material will result in a very different shape/configuration of the baffle/tip and chamber areas and relationships. The mouthpiece will play very very differently than original. If you start with an E and enlarge it to a G, there will be a moderate baffle which will increase the bright and projection, but can be moderated such that the original character of the piece is not so heavily altered. if you have to remove all that rubber at the baffle, it will be very far from original character. However, good points on both sides.