Hi Jaz
In the absence of a cycle it is difficult to comment but that does seem to be a very high dose of oestrogen. However if you say that your levels have been tested and you have not been absorbing properly and still getting symptoms then that must be happening. The answer re application site - is that you don't need to change the area it is applied to although each time you change it should be stuck to a slightly different area - in other words don't re-apply to the same part of your bum cheek when you change the patch and then clean the residue from the area you have removed the patch from. Then fine to go back to the same area the following patch change.
I have used patches for 10 years and also apply to bum cheek - but I use Estradot which are much smaller and stick well - although there are some supply issues. I can't see that the difference in patch would make a huge difference - given the dose you are using.
My suggestion re the HRT would be to ask the doc again for a blood test and take it half-way through the patch change period - not straight after a patch change or just before. Then if necessary and levels are very low - maybe try oestrogen gel - women differ in how well they absorb oestrogen from the different methods. Return of hot flushes usually indicate oestrogen deficiency.
If you are lacking in energy and have low mood - it could also be reduced testosterone, especially if you ovaries have now failed, and a good clue to this would be your libido - if absent, then this is a sure sign. It can be difficult getting this on NHS but it is worth a try with your GP and if not maybe ask for a referral to a menopause clinic if there is one in your area?
Have you had other blood tests to rule out other conditions too?
Hope this helps

Hurdity x