If you have to go all the way down to 1 to get a noticeable change in sound you are either using some ridiculous amount of gain or your vol pot is knackered.
Sure, the Evo is higher output than a
PAF Pro, but it isn't going to make as much difference as you are describing. As far as I'm aware the Jem and the PGM use the same vol pot.
Some things to consider:
Do you get the same problem on the neck pick up? The PAF Pro is actually slightly higher output than the Evo neck.
Does the volume change significantly as you role the vol pot down whilst using an uncompressed clean sound? If not, the pot is knackered.