I have the black christy on a Packer, if that helps. The heel feels kinda low, if I ever send em in for a resole, I make sure to get a halfslip
Both heels/ soles side by side, its not that much difference, but walking in the packerised and lowered Jobmaster is much better.
Next boot will be Black Domain RO or Olive Smooth LTT Jobmaster with Amortred Sole including Halfslip or something Lets see when I have the funds…
Along the lines of the half slip… What's the heel height of your lowered Jobmaster? I've read that if you order 1/2" lowered heel, Wesco uses a different last with a lower heel and the same toe shape, rather than having the boot lean back significantly, and that every every shape (Jobmaster, Packer, Boss, etc) has a low-heel version. This is most common with the Narrows (1339) last, with the Motorcycle Patrol last being it's 1/2" lower counterpart. I've never had this confirmed, though.
Regardless, it sounds like you're going to go with a wedge sole, to go 1/2" lower, then get a half slip. Does that sound accurate?