10s99, there is nothing wrong with raising the tension on the tie-off strings, but it is technically unnecessary. No one is supposed to hit the ball on the tie-off strings anyway. Even the USRSA says it's unnecessary in their stringers guide. However, if you have a customer that insists on pushing around on the strings and perceives that looser outside strings are a problem, by all means raise the tension on those strings. BTW, they will also be tighter if you hold tension on the tie-off knot with your pliers while you are releasing the clamp. Release the clamp first, then the pliers.