Hi all, I purchased a 2006 Fender Strat neck from a fairly reputable seller. It's a learning project, so thought I would adjust it as perfectly straight as possible. Then level the frets. Then adjust it back to it's proper bow under tension. The problem is, the truss rod is fairly loose but the neck still has a slight back bow. I don't think loosening the truss rod further will reduce the bow or allow it to go concave or even straight. Is it possible/normal for a strat neck to have some (very slight, almost straight) back bow with the truss rod at it's loosest position when not under string tension? Or is this the sign of problems and I should send the neck back? Thanks much.