You didn't mention how the sound was to you while driving, regarding being annoying or not.
Bottom line... are you happy? It's all about what works best for you.
i know ARB had a bad batch of front lockers that inadvertently were installed on my rig, but there wasn't any noise, they just stopped working. Wouldn't hold air pressure.
Had to go back to the shop that installed them and they had to deal with ARB to replace them. If I remember correctly the...
Wonder if you just kept them on over a year or so (10,000 miles?), if the whine would dissipate. Considering that gears are tool steel and extremely hard, I wouldn't expect them to "mesh" in with 1500 miles or even double/triple that range.
You could lone them to someone to run for 10,000 miles...