Michael H,
For what its worth as an architect from the same training/school (and a friend of) Jim Engh, my take is that when you admit you are building an un natural green (which most greens are) there is no problem trying to do a straight line.
However, when your dramatic style entails curved forms, which the mind equates with trying to be natural, no matter how hard we try, the standard gets set higher, and the idea of regularity offends the eye unconsciously. Jim's so called "muscle bunkers" are curved, but so regular that they don't look like nature enough.
I know, because I have often had the same problem and worked hard to overcome it in various ways.