Julio, let me say you , you have a big problem!!!
If your neck does not bow sufficiently with le truss rod completly loose, there is only two solutions:
- use harder strings : 9-42 to 10-46 or more. It is not very pleasant (if you are used to 9-42 for example) and, furthermore, the loose truss rod can vibrate because it is no longer tightened.
- Another alternative is to find a luthier with a neck heater, made for putting front bow back in as Rich said. I think it is the best solution but it is expensive and risky for the neck, incrustation etc.....
If it is a brand new guitar, send it back to the shop and ask for refunding immediately!
Believe me: the
neck bow is the WORST problem a guitar may have.
Cedric