I have a nice set of irons but unfortunately I have a glass top electric stove and I haven't used them in about 8 years. They dont heat evenly on the glass top and I cant justify installing a propane cook stove at the moment.
Everything I read says the flax seed leaves the best surface also but I've never tried. It seems like it would be worth building a few base coats with the flax and then finish it with a few rounds of your choice oil. The science behind it says it's because the flax fat polymerizes and has more of the polymers in it than say olive oil. It would be interesting to watch America's Test Kitchen do a cook study and season 5 different pans with 5 different things and see how much better it really is. They could do flax, olive oil, veg oil, coconut oil, butter/shortening.