I was going to say those test cuts look a bit tear-y, but the link with the oil looks good.
I use the toner transfer chemical method, and it's pretty good. To get the drill holes centred accurately when drilling free hand I put a 0.5mm via on every connection, and that centres the drill quite well. A 0.8mm etched hole can let the drill start on the side, but 0.4/0.5mm pulls it to the centre. I even toner transfer the silkscreen, which helps a lot when you have lots of parts.