Seems like I finally learned hole filling around loopy structures like this. Got to 152 pretty quickly and took about 5-10 minutes a piece to cut each of the last 2. Definitely was confident in where I was losing steps here more than usual in a checkerboard.
146 update: the last 2 was a really good/sneaky cut. Thankfully it wasn’t really my pipelining because I felt like there wasn’t anything else I could do with it when I had 148.
Found so many 150s, where are the final 2... 🤔
EDIT: Ok after many days of revisiting this level I finally got it, but then I immediately had more inspiration and found another 2. I don't know why it took me so long to try the idea that got me 148, but the 146 path is really hard to see. Best of luck to all who attempt.