As you have several pair, you will in the future, have the opportunity to foster young from 1 pair to another if necessary.
Finches are like people, some are just flat out great parents from the get go. Some do better as they go along. And some - well they are hopeless cases.
Most, people and birds, fit the middle group, then the 1st, then lastly the

We all have our ups and downs with our birds, no matter how long we have them. You are doing pretty good for a beginner.