So I think I figured out whats going on. When laying horizontal shells, it lays a fast loose layer then slow tight layers. Always in that order. That would make sense for top layers as the loose layer would be on the infill and covered by the outer layers. However, that loose layer on the bottom is is visible outside the model and the tighter better quality layers are on the inside of the model. I'm attaching pics for an example. I'm not sure if this is a bug or not, but I'll try to look into the code to see if I can reverse this or add the option to reverse this, however, it's been a few years since I've messed around with any real code and never on anything this size. plus I have to learn perl.