If you don't like the resistance of the PRS pots, you don't necessarily have to change the pots and loose the grat taper and audio quality in the process.
Just get yourself a couple of medium sized rubber O-ring sealing washers, pull the knobs, put the O-rings on the shafts and press the knobs on top. That will give you a decent amount of friction with the original pots.
If you dislike the lampshade knobs themselves...... well,....... there are many other styles out there. I personally would stick with original PRS parts though.