At the risk of being seemingly out-of-touch with reality and causing you to become angry, may I propose an alternate explanation. What if you are not physically hearing better and it just seems that way because you are in a happy/euphoric environment?
For example, maybe there is an alternate explanation for the blasting car radio which you can hear fine without your hearing aids. When someone drives a car with the windows down, it's usually necessary to crank up the volume in order to overcome the road noise and wind noise.
Upon stopping the car, instead of readjusting the volume, we usually just shut down the car. Anyway, I do. So the next time someone starts the car (and when initially parked and stopped) the radio is blasting. This happens to me all the time.
May I ask that we poke at this (just a little)? When you were hearing the car radio just fine without hearing aids, did you do any A/B comparison with and without aids and switch them back and forth to make sure you can hear better without aids? Including, listening at the exact same radio volume?
Without an alternate explanation, I am not aware of any other location-related hearing loss??? Unless it's altitude, and you live in a mile-high city?