If I was in your shoes, I would really be confused...(posted 8467 days ago)I would start by using fresh chemicals for my tests, you will never get any constant results by using old developer, especially if you are not really sure about its activity levels. You should start by doing a film sensitivity test also. The compesation for the raise in the dev. temperature you have mentionde was not enough. If the normal dev. time is 9,5 minutes for 68 degrees farheneit, then you should develop for far less than 9 min. at 73 degrees.