Hey guys, I just bought a used ATK300 and havean issue with it: I tuned the bass down to Drop C for a new Band. On the Low C, I use a 120 string gauge. But the tone dies very quickly and the sound is very dull. On the bridge, I already set the string action highest possible. I don't want to change too much on the truss rod since I am pretty happy with the other strings.. Any ideas?