I have talked with Tim and he suggested the riffraff so i'll go for them.
Should work fine for you. A bit punchier / middier / more focused than Mules but still classically voiced and with great cleans - the RR neck is one of BKPs hidden gems IMHO.
I'm also considering a pot upgrade. I think the stock are 300. Is it worth? Do they really change the sound of the guitar?
They don't change the basic voicing / character of the guitar but higher values pots will bring back a fair share of high end content - and you'll always be able to tame the highs again with your tone pots if needed. Technical part : even wide opened your pots act as part of a low-pass filter circuit formed by the pickup / pots / cable / next stage input (amp or pedal or whatever). The higher the resistance, the higher the cut-off frequency.
IOW : go for 500 or 550K pots, and while you're at it get better caps also (not sure the type of caps - ceramic, paper in oil or whatever really makes a huge difference but higher quality caps will be closer to the nominal value and _this_ can make a very obvious difference) and try either a gibson 50s wiring or a treble bleed cap - both are ways to avoid loosing too much trebles when rolling down the volume pot, each has it pros and cons (IOW choose whatever works for you).