Ive tested GMG colorserver (not ink optimizer) and Alwan CH. from a lowest delta e perspective, GMG was the winner, but by a negligible margin (both achieved under 1.5 delta e toward the target data). Image quality was good for both, and I didn't notice any issues with fleshtones with Alwan as you mentioned. From a verstility perspective, Alwan was the clear winner, honoring embedded profiles and generating DVLs on the fly.
But Louis is right in that if you have the ability to implement DVLs in your current workflow, you might see what can be done there before making a sizable investment.
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