A flat neck should be pulled into sufficient relief under string tension, so it must have had a significant reverse bow to start with.
Either that or the neck is very very stiff indeed, so that the string tension hardly bends it.
When I’ve fret l levelled a neck, I’ll then normally give it about 1/2 tightening turn on the truss rod which ends up a good starting point for the relief as I like it (using 10s) before stringing it up.






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