If you muck about with the dosage of progesterone you are very likely to get erratic bleeding!! The idea is to get a consistent dose for at least 10 days that will induce a proper bleed that will shed the lining. If you don't shed the lining it will build up and cause problematic bleeding or thickening of the lining which is not good. Ladies please don't experiment unless under the advice of a gynae. DG x
For a lot of women (myself included) HRT will be a series of experiments, that usually have to be done by herself, because a lot of doctors can't think outside the box.
I don't think anyone is advocating taking an erratic dose of progesterone. Just to maybe take a lower dose for the first couple of days, followed by the normal dose and number of days you would take it, and then either stop or again take a lower dose for the another couple of days. I can't see anything wrong with that. Of course those who use Utrogestan may have problems with this, because they can't as easily alter the dose as you can with tablets like Provera.
I personally think it's worth trying for those who are interested, even if it's just once, just to see what happens. I'm always up for trying something new. It may not work, or there may be no difference at all, but no one ever progresses in life without trying something new.