This was really helpful thanks for that detailed write up. I'll try taking it down to 2mm on all strings and try adjust from there. With the G string at 1.75mm I think I might be able to get away with a lower action. But this is a good start.I personally set my strings around 2 mm at the 12th fret across all strings, maybe a tiny bit higher than 2 mm but not much. Maybe about a .010 relief. I set my Z and AB1 this way, which is higher than factory spec. Both of my Dingwalls could take a much lower set up, but I have my preferences.
Also, thanks for sharing the article, Sheldon uses the following heights:
Sheldon Dingwall: We only have a height spec for the G, A and B strings. For simplicity, we quote the G-string height spec only. The A string is always 1/64″ higher than the G and the B string is always 1/64″ higher than the A. For example G = 4/64″, A = 5/64″, B = 6/64″. The in-between strings (E, D and C on a 6-string) are adjusted after the G, A and B strings so that they form a smooth arc along the tops of the strings with relation to the G, A and B.
The specs for our import line are: Nut height – .006″ (+/- .001″), Neck relief – .015″, G string @ 12th fret – 5/64″.
The specs for our flat-headstock domestic models are: Nut height – .005″ (+/- .001″), Neck relief – .015″, G string @ 12th fret – 4/64″.
Thanks, I'm aiming for super light strings but it's been a challenge to find ones long enough, here in Australia. I'll reach out to Fretnation to see if they have a recommendation for a 40-120 set.I run super light strings. DR pure blues VW’s .040 or lighter sets from Payson strings.
Once I have it tuned to pitch, I adjust the truss rod for a whisper of relief at 12. Then I lower the G until it won’t play clean, and ease it back up until it plays clean. Then the other strings aiming for a subtle arc over the 24th. Then intonation and more fine tuning.
It ends up super low, and I play with a light touch or slap.
Lots of string options! Check with FretNation or Payson.
These are the specs I set my C5 up to. Not sure if this helps. And sorry the action is in Standard:
View attachment 7104774
That's good to know so that would
B: 1.98 mm
E: 1.98 mm
A: 1.78 mm
D: 1.5 mm
G: 1.19 mm
This would be a dream setup if I can get it this low.

Jason at Fretnation can advise you on the DR's.