I have made 30 5 gallon batches of different made up recipes. I started out all right and enjoyed my brews. Then, the last 5 batches keep turning out sour. I can’t stand the taste so I have been dumping them out and trying again. Also, they were over carbonated despite using the calculator. Is it the temperature that I am storing at that is making the sourness? The sour batches were when I was fermenting during the summer months and I do not have A/C. The basement was about 74 F. I have not made a batch since August because I got fed up with the screwups. I would like to conquer this though.