To keep a long story short, the grinding worked but the finish process didn't. A chemical reaction (or two, or more) caused the floor to be cloudy and several professionals to claim "I've never seen this before". The remedy? Take it all off and start over. back to the grinding. What should have taken a week took almost a month and we lost valuable construction time, but there was no option to fix it later.
I describe the finished look as "leathery". The light colored specks you see in some photos are the aggregate (gravel) in the concrete. Normally you wouldn't see them, but they show themselves after grinding. Except for the time, this is what we had hoped for. Here are some photos of the finished project.