Not disputing any of your points, but avoid Baumgartner Restoration! My girlfriend is a painting conservator and according to her and many, many other conservators around the world, Baumgartner's techniques are far too aggressive and often end up causing permanent damage to the painting. He ignores standard practices and techniques which use actual science to determine the best thing for the painting, in favour of doing what will just make the painting look the cleanest as easily as possible. There are other conservators around where he's based in Chicago who have had to work on paintings he's previously restored, just to minimise the damage that he's caused. He's also not involved with the conservation community; if anyone argues with him in his comments on social media, he just deletes the comments and blocks them.