I seem to have been lucky so far applying intelligence and a bit of fiddling to some quite decent instruments. People seem to have started coming to ask me to do things. Anyway, no way the neck of a guitar should be dead straight all along the fret tops. The strings should in theory always leave the frets at the same angle, whicheve fret is fretted. If you think about this for a bit, because the saddle is raided a bit, it means that there should be a very gentle arc to the neck. If it's too straight you will get fret buzz. Personally I set a neck straighter (and with a lower nut) than many and put up with a bit of buzz, but that's because I don't have a hugely strong left hand but like the sound of 13/58 strings if the table will stand it.