As-salāmu ʿalaykum wa-raḥmatu -llāhi wa-barakātuh, I have multiple questions regarding an oath to Allah, this question is troubling me so if you could respond the fastest possible.
Some time ago, i made a promise to Allah, that every time I would do a particular action, I would donate 20 $ in charity. After some days, I had to give 60 or 80 $, (I do not remember was it 60 or 80, but, let’s say 80). I dedided to tell Allah that I break the oath, but I would still give the 80 $ to charity and i would offer expiation for the oath so that in the future, I do not have to give 20 $ each time I break this promise. Then, i had broken the promise even more times.I did some research on expiation and saw it was not sufficient to donate money to charity rather I would have to feed or cloth ten poor persons. I did not have the ability to find these 10 persons so I fasted for 3 consecutive days. The day I finished fasting, I came to know that it is permissible fo give money to an association that does the kaffarah on your behalf.
Here are my questions :

1. When I told Allah that i break the oath, was the oath broken and is it sufficient to give the 80$ or should I try ans estimate how much time I broke the promise after ?
2. Was the 3 days fasting sufficient for me ? even if I could have given money to an association for kaffarah on my behalf.(I did not know about this ruling). Should I give the money for kaffarah now ?( if the 3 days was sufficient, then most of the other questions are abrograted)
3. Should you feed the 10 poor person with one meal or two meals ?
4. For me, in average a home cooked meal is around 8 $ (CAD)max, is it sufficient to give 10 $ for each person I have to feed or should I give more because a meal in a restaurant is more ?
5. I know that this organization takes 13 percent for fees, should I give more than a hundred so that the fees are deducted ?
6. I do not know if this association feeds or clothes, and does it give to 10 different persons, but I think they do, should I still give them ?