You do realise you're actually going to have to do some work right? if you're trying to flatten loops that run around a cylinder simply enable edge constraints, select the loop and scale it in the appropriate direction.
Mmmm no constrains dont help to fix much and the graphite modeling I dont know if there is any usefll tool for that ... it woudl be some kind of normalization of the angle between and edge and the other in order to reduce the up and down and so flattening the circles but without altering the whole loop inclination ..... if…