You should easily be able to increase to 4 pumps of Oestrogel because that is within the licensed dose. If you need to go over that, you might need to go to a private clinic.
Personally, I had my normal physical symptoms controlled from just 2 pumps or 50mcg patch. The anxiety, the insomnia, the inner tremors and heart beating hard and fast through the night - all that only got better when I increased my estrogen a LOT.
I'm now on 200mcg patches and 4 pumps of gel at night. Things are not perfect but they are the way way way better, the best they have been since this all began about 3 years ago. No way I'd get that dose of estrogen on the NHS though...