Millercarbon hit it on the head, though. A tough study for sure.
Not the head. The navel.
When performing your listening tests be sure to record and standardize relative humidity. If the record is to be air dried for 24 hours then ideally the relative humidity must remain constant throughout in order to avoid altering the findings. Needless to say if the record is stored in the sleeve then the micro-environment created within the record jacket must be monitored. Otherwise if the record is damp it increases humidity in the sleeve thereby creating a false positive situation.
We can go on and on like this for freaking ever. Or we can play em and get on with it. Being audiophiles the only approved course is to keep anal-izing it to death. Especially since playing records is the most OCD of all. The only real way to enjoy a record is after cleaning it 15 different ways, drying it 35 different ways, placing it on a platter with/without a mat/clamp/weight and then after carefully confirming level spend the next $5k and 5 years using every jig and geometry imaginable to second-guess alignment. Only once this is all done can you run the motor a week to be sure it is warmed up and even then there will still be 15 different things to worry about.
Which version of the record are you talking about anyway? No not that one! Start over.....