This question proves I'm obviously not an accomplished classical player--I'm a jazz player getting more and more into arco. While playing certain lyrical jazz melodies (arco), my E string vibrates sympathetically. (And sometimes my A string). I can usually dampen the string with my left hand, but at times it's easier to just "lean in" to the fingerboard and dampen the E string with my big fat head. Is this acceptable? What should I be doing instead?