Volume differences in captures

I’ve been doing a few captures of my own. Only a few, I don’t have a giant amp collection.
I’ve noticed that there is a big difference in overall volume from capture to capture of different users.
For the most, I find most users captures too low in volume. The few capture I did of my CAA PT-50. I noticed that I had to do them a few times and make sure I was getting the maximum volume out of the capture without clipping. So my point. While I really like some of the user captures I’ve been downloading, I find the volume too low. Now I know you can raise the volume once you have the capture downloaded. But I kind of feel they are coming up short due to the lack of proper levels during the capture process. Should there be some guidlines to proper capture level so we can have some uniformity in the captures we share?