Hi i didn’t recognized your first question:
A) use a decend widget size and not auto
B) use the customHight property in the tabulator json
C) use the latest version of ui-table - there is a fix for what might be your problem
And last but Not least a simpler flow as an example showing the use of ui-table helper
Even if you don’t have a device or software sending syslog messages you can use the inject node to simulate the data input.