After hours of shop vacuuming and flushing the floor with baking soda, this is what it looks like after drying out.
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I knew the tile lines were not going to go away, but I didn't think it would look this bad! I'm guessing the efflorescence wicked in a higher concentration along the cracks of the stick tiles, which resulted in this pattern after etching. Both this appearance and the fact that the acid stripped most of the surface minerals, led me to believe acid staining was out of the question.
I decided to go with a semitransparent concrete stain from Behr. This product is really just a very watered down paint that soaks into the concrete. It's important to not apply it too thick. I applied a very thin coat of a charcoal color. It didn't do much to hide the hideous tile pattern so I added a second coat of it. To my dismay, the floor ended up black. After sleeping on it, I decided to feather in a lighter color gray over it in a random pattern. This is what I ended up with.
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I topped it off with one coat of Behr high gloss concrete sealer, which I have had positive results with in the past. I could see the concrete darken as it was going down - so I'm quite sure it absorbed into the concrete for good adhesion.
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I also hung my tv/monitor.
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Overall, I'm happy with the way the floor turned out. There are some things that I would have done differently, but hindsight is 20/20. Only time will tell how durable it ends up being.
Sunday, I should be able to begin installing the sink and pre-rinse faucet. I'm still waiting on the hood to ship, but it should be here soon. I'm really close to the first brew!