The agreement weight is the basic amount to add if they agree. The disagreement weight is the basic amount to add if they disagree. That's why the latter is negative. Tuning is complicated: You need representative data that has both records that agree and records that disagree.

You can get the query the page is using and run the query yourself: https://docs.intersystems.com/iris20252/csp/docbook/DocBook.UI.Page.cls…

I think the Web app has to be /csp/healthshare/fhirdemo, i.e., you can't include .well-known in the Web app. At least, I've never seen a Web app like that. Do the docs say to do that?

If you do Management Poral > System Administration > Security > Auditing > View Audit database, it may tell you something about the error. You may first have to enable the %System/%Security/Protect error in Auditing > Configure System Events.