So, the drivers do matter and the ones that are in non-OFW are not as good...
When I first startet to run e2 on my UFS 910 PQ was even worse than todays e2. PQ was just terrible and completely inacceptable for me. After a while they (AAF-Team) were able to improve PQ significantly and since then I used e2 on the 910. But still no comparison and not even close to the excellent PQ of Original OS/drivers.