The UM3X/Pro30 is designed for warmth on the stage, not as a neutral studio reference. The UM3X does not have a neutral signature, and neither does the W60. The UM Pro50 and W50 are incredibly colored.
The closest Westone has to a neutral signature is probably the W20. Turn your ARK03's bass knob all the way down. That's close to neutral.
IMO, the SE846 is still overpriced, but it's a far better buy (and more versatile) than the W60.