Yes, you can play around with the progesterone part of your regime, I do it all the time and it's never done me any harm and I used to do it with the pill too if I had an important event coming up.
I am on the Oestrogel/Utrogestan regime and the beauty is you can adjust the dose of the Oestrogel and the timing of the Utrogestan to suit your needs.
If you still have symptoms on 1 pump of Oestrogel then you can up the dose to 2 pumps. I am on 2 pumps and split it by 12 hours to keep the levels up and that has really helped.