Thats the sign of a regulator problem! The reg housing could be 180 out. I remember you said you checked the spring so we can assume thats not the problem. You could have a pinhole in the diaphram. That would cause your problems also and seeing you richened the low end up a bunch....the loose diaphram would allow fuel to go into the carb!
You need to go back to flush on the regulator and whether you turn it in or out, you should only do it 1/16 to 1/8th at a time. But you are much closer to a diagnosis.