I have a thinkpad X1C6 wich has pretty similar hardware. At the time now I run only thermald and auto-cpufreq as a test and it’s working fine so far.
For power saving route with tlp installed, I would suggest this tutorial here in the forum.
Some useful links for troubleshooting and firmware:
Lenovo ThinkPad T480 - ArchWiki
LVFS: Search Results
fwupd - ArchWiki (is in the manjaro repos and i highly recommend it)