Hi Lanzalover
Sounds like you know what you want to do - and as I was reading your post I would have advised the same! I use utrogestan vaginally and on a long cycle - for the same reason that I wouldn't want to use it continuously vaginally and also I don't like the side effects and how it makes me feel.
Your symptoms may just be due to the settling down period - my breasts have changed semi-permanently on HRT (slightly larger and more dense - they were floppy shrunken things before I started HRT and when I stopped for 3 months) but they never ache any more.
Some women seem to be able to feel the effect that HRT is having on the endometrium - and maybe this is more apparent as you get older - I certainly feel a certain heaviness at the end of my long cycle, and also get some minor cramping when I start the progesterone phase - well before the withdrawal bleed.
The licensed dose is 12 days x 200 mg per 28 days used orally - which is also what the French instructions say to use vaginally or orally. However limited research has shown that more is absorbed when used vaginally so theoretically you could use a lower dose (depending on how well you tolerate the progesterone) although this is not advisable except under the supervision of your doctor so that you can check on the endometrium regularly.
Personally I would not want to use progesterone for fewer than 11 days (especially as you get older) because although it is dose-dependent, I am sure it takes time as well as a sufficient dose to change all the lining from proliferative (as with oestrogen) to secretory - which can then be shed when you stop the progesterone.
You might also be able to try a slightly longer cycle eg monthly rather than 28 days?
Hope this helps?
Hurdity x