I am glad to hear that you are on profit already so quickly. Most of the students give feedback to me that they succeed to make profits after the 3-4th month. However everyone is different, and some do it faster. Good job!
It is not bad that most of the profit came from one EA. That is the idea of placing many EAs in one account, because the moment we place them on Meta Trader, we do not know from which one the profit will come.
The optimization depends really on the market and the performance. If you have made optimization and you are doing profits, and you do again optimization most probably you will not see different results as parameters in the indicators.