Lock ring is indeed tight, I don't have a torque wrench to verify it's exactly at 40 Nm, but the mechanic at the shop told me it's indeed tight, and there is no play in the cassette/individual cogs, so I don't believe it's an issue with the lockring being too loose. I didn't check the freehub bearings, they are sealed cartridge bearings, do I just trying turning them by hand with the freehub off? I don't want to even attempt to open up the bearings cuz I'm scared I'll mess something up haha...