I just changed to a new set of strings and there is a little ring/buzz on th G-string when I press the string down and play but not on the open G. I've increased the string height by 1mm and loosened the truss rod which seems to help a little. My question is, how much is too much relief? From what I've read, there should be just enough space to slide a credit card between the Ab and high G when you press down in the middle? Or should the gap be bigger? Also, do you need to loosen the strings when adjusting the truss rod? I'm going by 1/4 turns for this. Thanks