Just wanted to let you know that you aren't alone! I don't have any words of wisdom - I'm figuring this out as I go.
We've had Sucre for 2 weeks now, and we're still working on the aggression issues. This is his 3rd home. He was abused and exposed to drugs, so I have my work cut out for me.
I'm glad to hear you are making progress.
We're having a little showdown tonight. I've been home all day, but had people here working on my satellite / internet, and I've been really busy cleaning, doing laundry and hand feeding 3 lovebirds and a parrotlet. I still don't trust Sucre enough to let her out when I am not keeping a close eye on her - I have 2 small dogs and she really has it out for my Chihuahua, and I didn't want the people working on my satellite to get bit running in and out.
She's really bonded with my husband, and he was gone all day. We're going through a phase right now to where she does not want me sitting on the couch with him - we were on opposite ends about an hour ago and she completely ran over and attacked me. (I had to get my tetanus shot updated day two of Sucre!

)
When this happened, we scolded her - she seems to understand NO, but was really hard to calm down (I wish I knew exactly what she was saying!) We put her back in the cage and she screamed for an hour. Now she is behaving totally normal.
We'd had several what I would call good days in a row, and now I feel like we've taken several steps backward.