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Volume matching will solve the first problem. Sub calibration is more complex, since there are two volume controls. I really wouldn't sweat the difference in volume settings of the two subs. If you bought them at the same time I'd be concerned, but since they are seven years apart, I wouldn't...

BTW, you don't have to do this since YPAO should balance them. It just kind of evens things out, and 17dB is a pretty big discrepancy between the levels of the two subs. Level balancing them at the sub volume will just make the final calibration simpler.

I added a bit to my first post regarding resetting the output levels on your receiver. You want to be sure the outputs for both subs are equal before matching them.

You need to volume match the two subs. 9 O'Clock volume on a 7 year old sub isn't necessarily going to be the same as a new one. I think you have an SPL meter. So, turn off the new sub and play a test tone on the old sub. Adjust the volume on the receiver so it plays back at a usable level...