I have a bit of a dilemma with my DIY NAS rig.

Does your setup have any way to do noise insulation? I suspect the answer is no but figured I’d throw it out there, surprisingly noise insulation helps more than you’d think. I have a bunch of drives inside a desktop case with insulation panels built in and the drives themselves are in there with rubber anti vibration screws/mounts. Barely ever hear anything from the drives (granted my WD Reds are probably quieter than your current Seagates).

Just something to think on whether it’s an option for your current NAS rig or a future configuration.