Re: Arm and pickup selector switch
I did manage to resolve this issue as I realised looking at the photos available on Rich's site that the trem angle was still slightly off - it was difficult to tell as the marks on the side weren't very viable in the cavity with how low the Edge Pro sits. Having tightened the springs the arm now clears the pickup selector.
I also found the cause of the tuning instability as the low e saddle was too far forward and was contacting the back edge of the pick guard. I'm not sure if it was set this way when I took the guitar for a setup last time or if it had moved but moving it back so it didn't overhang the edge of the block fixed this and it doesn't appear to have knocked the intonation out much (it is now just very slightly sharp).
The only issue I have now is that pull up range is only a tone on the low B to the G and a semitone on the high B and E. This is because the back of the bridge is hitting the bottom of the cavity.
I'm not expecting the range of a Jem on pull ups but a little more that this would be nice.
Obviously raising the bridge height would help - it is sitting just below the pick guard level (1mm or so) but the trouble is the action is nearly perfect - nice and low with no real fret buzz apart from from the first few frets on the low B if I hit it harder and the 22nd fret on the high E if I do a wild bend.
From what I can read the only solution is to shim the neck up?