The tomato is a tropical use to consistant temps and moisture.
BER is a product of weather extremes and/or calcium deficiency. Calcium deficiency can be addressed by adding calcium (lime), magnesium (epson salts) and/or not using commercial nitrogen in any significant way. Ammoniacal nitrogen is used most often in commerical fertilizers and inhibits a plants
ability to take in calcium.
It's a good idea to either keep a journal or takes notes from time to time. I make notes, refer back, commit to understanding and then discard. Also, you should be able to find helpful resources at a local University. In your case you should have Ohioline Factsheets
bookmarked. Helpful, not gospel.