Hi all, I'm after some advice as to whether two 4x10mm unidirectional CF rods would be sufficient in a 7-string neck to mean you wouldn't need a truss rod (leaving aside the matter as to whether this is a good idea or not, and I'm willing to concede that it's likely not...)? The neck itself will be a single piece bolt on made from korina with an ebony fretboard and not overly thin. My concern here is that if I went with that amount of carbon with a truss rod, it might be too stiff for the truss rod to work correctly. I usually go with two 4x4 CF rods parallel to the truss rod and have run into this issue before with a laminated neck. As stiffness increases with the cube of the thickness (ie. a little bit extra depth = a lot of extra stiffness!) that is kinda concerning. I have built truss rod-less guitars (acoustic) in the past but used some pretty substantial aluminium box section for those. Any opinions or is this a trial and error thing in reality?