I've never cycled PM & BO, but from my PM & BO experiences PM didn't cause any shrinkage at all, whereas BO has caused a bit.
Thinking back on all the research that I did, in summary I concluded:
- PM promotes breast growth (but not much else other than a loss in libido)
- BO & glandular / HRT promotes all over fat redistribution for feminisation, weaker erections
- complete abstinence from erections / not using down below significantly promotes shrinkage
Which all seems coincide with what I have experienced.
But of course we all react different to the different herbs, pharma etc.