I'm not disappointed in you at all! You are doing what you think is best, and I try to do the same for my flock - that's all we can do. I was actually surprised that Dave didn't pressure me more to speed things up, and if he had I probably would have, but we surprisingly agreed on many things. My "quarantine" was far from the best - I do not have separate air spaces and we never went so far as to change clothes between visits with everyone. Washing our hands in between and no sharing of toys was about as extreme as it went.
I know the feeling, 2 budgies and 2 cages

I think they are both happy living separately at the moment though. Jerry still plays VERY well on his own, which I am happy about. Whenever he enters Winston's cage it's NOT to play with Winston, he goes straight for Winston's toys!
No Winston adventures in the past week either. And every night he seems content to hop back into his cage.
The other night I felt bad for Winston though - recently I rearranged his perches and quickly realized that the new arrangement wasn't good since he was pooping in his food dish. So I took Winston and his cage to the bedroom to fix the perches differently (cats and dog were roaming at that point, so the birds were in cages). Jerry and Lulu were still caged in their room. The entire time that I had Winston in the bedroom - and it was for awhile because I let him out to fly while I fixed perches - no one contact called to him

If I take either Jerry or Lulu out of the room while the others are caged for whatever reason, they contact call up a storm. Made me feel very sad, as if they didn't think he was a flock member yet. He still has a ways to go in all areas though - I know that bringing him in was a great thing, and he is fitting in, but moments like that have me second guessing things.