Firstly hun, it's not easy having a bub attached to you all the time.
I think the length of the feeds each side seems ok but there might be something else going on, do you burp her in b/w sides?
DD2 was always a bit off from say 7pm - 9:00pm the one time i am busy making sure tea is on the table, getting DD1 dressed for bed etc and i was loosing my mind.

However this is the time she would have been most active whilst 'inside' and i think it took her quite some time to get used to being OUT IYKWIM. instead of feeding her all that time can you try feeding her to sleep in a carrier then walking around, do you have a baby swing? That made a huge difference for me as she would settle ok in that.

I'm not sure if i'm helping but couldn't read and not reply... hopefully Barb or someone has some more answers for you.