I agree too. I am still having a cycle but I've discovered after much trial and error that my Estrogen needs to be around 700-800 (day 21) at the moment for me to feel completely well - even though this gives me very sore and swollen boobs for the last 14 days of my cycle (but this happened naturally for me before Peri anyway).
I too have worried that it is too high, but I get a return of my symptoms when I drop below 700 ish. Not sure if it will always be that way as I get further into Meno, but I am trying these days not to think too much about it and just concentrate on being well.
In my personal experience, reducing your Estrogen when you've been on a set level for a while, will cause you symptoms - I experience exactly the same withdrawal as I do when I try too quickly to reduce my antidepressant medications. If you really wanted to try to reduce it I think it might be a long haul - doing it very very slowly, so your body has time to adapt to each reduction.
Good luck xx