I have only been on Iodine a few months, so I may not be the best person to answer your question, but the flushes I have done it that time haven't been radically different from normal in any way. Each flush is different, but there is nothing that gives me the sense Iodine has had a siginificant effect on my flushing since I started it.
I too would be interested if others have had significant changes though!