I just bought a new fender mustang, and am setting it up. 2 options: 1. If I get the neck to be perfectly straight, there is barely any height (when first and last fret are pressed) in the middle. Not even enough for a single business card. 2. If I tighten it a bit so that the bow is slightly concave, I can just get 2 business cards to fit (but not a credit card) I get a slight bow. There is no fret buzzing with either of the 2 methods. Which would be better for the bass? I assume that a perfectly straight neck is better? I had only tightened it a bit in order to give it some lee-way, in case the temperature changed, whatever, so that it would never be convex... I would really appreciate an opinion from someone who is more familiar than I with truss rod adjustments. thanks!