I thought that's what the estring was all about Tempest.It lasts three months and gives a steady dose of oestrogen.?
By the way I tried the one dose of gel morning and one dose evening it was no good for me.
I thought,like you say I'd be better doing it that way to get a consistent dose throughout the day but it didn't work it seemed to make me hyper at night and since I've changed to 2 doses in morning,well 2.5 now,it's been better I mostly have really good days,it's first thing when I wake I feel a bit flat but once I'm up and dosed up again my days are pretty good.
Good luck Tempest you deserve it xx