For both volume and tone the HB is on 500k and the JB is on 250k. When the switch is in the centre position the HB PU could electrically "see" the JB 250k volume pot.
Action is reasonable at 2.5mm @ 12th fret. Bridge isn't set to any extreme heights or intonation offset.
Can't adjust any extra height out of the JB PU until I can find longer PU screws, as the former P90 screws I'm using now are only just holding on.
Now that you have reminded me Waz about the history of the JB PU I might take up Billb's offer of that EMG Select PU.