Hayley,
I'm pre-op and > 1year on HRT and Spiro. I also noticed slitting nails, hair that just hang and are dry and split ends, very dry, all the stuff you mention.
It appears that it is the E dosing that seems to do that. Yet we have to, as we hardly have any growth hormone to help feminization as would be when going through puberty.
I did notice having been completely of E for about 1 week, having ramped down over 5 weeks, and restating small (one small tab/day) that my hair got more "greasy", skin less dry etc. That change came pretty fast actually.
If you are e.g. on 3 - 4 E tabs of the higher value (for menopause that is) then you are essentially overdosing on E, compared what the stuff was made for, and also compared to what GGs would use i.e. 1 pill/day rather then 3 or 4.
Lastly I spoke to my beautician doing my nail, and she said peeling/splitting nails are due to hormones. It seems a pretty well known thing to them.
So if post-op staying on pre-op levels as are plenty of doctor's recommendations... afraid nothing will change. Also myself like Julie had bullet prove nails, alas no more and my hair are ->-bleeped-<-e also.
Seems it's hard to have it all...
Axelle