Yes, it is interesting isn't it.
The whole HRT system of prescribing at the moment seems, at least on the NHS level, very much "suck it and see", matching people with from range of criteria
on a list I imagine, when as you say, we are all different. I had no perimenopausal symptoms at all until I was 52 looking back, when a lot of my friends were well on the way to menopausal. But at 53, it was assumed my periods were on the verge of stopping, which I now suspect, isn't the case really.
With the question of which progesterone would work best with which Estrogen, it's frustrating because, at least in my case, it's very difficult to actually get to speak to someone who could advise and maybe look into alternatives to try. So may never find the perfect combination for each person.
As I said, its a mine field but hopefully, as more women are looking into HRT as an option, more resources will be put into place to really be able to see each person as an individual and prescribe betted suited combinations. Not to mention, improve supply of the various options!
I will start sequential if it doesn't improve because despite any issues I've had, I feel SO much better on HRT then I did before, so I'm still positive