LOL- armchair quarter back. I've refinished and installed more vct than you have hairs on your head.A regular black pad would have taken off more of the crud. Stripper used judicially would have given you an even better outcome. Black out glue when soaked can come up through the edge of the tile and leave a stain the can often be remedied with solvent and effort - and that was installed with blackout. You thought that Armstrong vct was peel and stick.

. Did you neutralize the floor? I didn't see that step. With a build up like that a little hands and knees action with a scraper to get the skack off the edges .Running a 175 up to the edge won't do it. When are you going to burnish it to harden the finish? There's a few other things but I'll just leave it be. Some of the purpose of this board is to educate and that's all this is. You may not like the delivery but if you're on the
IICRC board for hard floors you should know some of these things. I'll be happy to help you learn some valuable information if you wish. No need to get pissy.
If you want the floor to gleam, this is your best friend. $475 on craigslist here.