How to fix tubeless tire leak at rim seam
The fix ended up being very simple. After inflating the tire to 30 psi to seat it, I decreased the psi to 15 and rolled the tires like normal over the next couple hours.  Then I dropped the psi down to my running pressure of 5 psi.

The problem simply seemed to be that 30 psi was too high while the sealant was sealing the gaps.  15 psi seemed high enough to push it into the gaps and low enough to let it seal.