Hey TarlyPDX,
Using a large floor scraper at this stage, coupled with using occasional paint stripper on tough areas, is really the only surefire solution for you.
The key is working is small workable areas, like a 5 ft x 5 ft or smaller area at a time. It will just take patience and elbow grease to remove the unwanted paint, since you've already applied it to the surface.
I would opt for cutting the dilution of the vinegar in the water to a final wash of just water itself once all the residue/gummy area is removed. Even Citristrip can give off some odor, so always play it safe by using chemical resistant gloves as well as eye and breathing protection while doing this.
Joseph