Hello there @looore91!
Considering you have covered most of the available solutions for this particular scenario (driver update, Omen discrete switch, forcing GPU from NCP), I believe the path left is to fully disable hybrid graphics in your laptop. From what I could gather, it’s possible to do so from its BIOS.
https://support.hp.com/us-en/document/ish_9372714-9372764-16
https://www.reddit.com/r/HPOmen/comments/1e8e2cs/completely_disable_discrete_graphics/