Re: 22nd Romulan Cloaking
I think the subsequent ENT novels explained it simply enough. The cloaks seen in "Minefield" were so experimental and untested that the ships which used them self-destructed from the power overload. It took a hundred years to develop a cloak that actually worked properly. I don't see the problem in a retcon like that.
"Pitching is simple -- cheese for the kitchen and a yakker for the kudo." - Dennis Eckersley