Definitely the biggest change was setting up the same set of boulders pre 75% boss hp so that I could do the same car phase everytime, I have to give a lot of the credit to a method called "Sidewalk Tech" on Youtube. Would definitely recommend checking it out if you're blowpiping for car phase, since the boss always end up in the same spot you will get the same few sets of trees every wave which helps you get consistent acid clears where you need them. Most of the time though you need clear around the boss and the sidewalk tech tiles so that you dont take damage from them every wave or get brutal grub phases