Oh, well, after TealKnight demoted it, I promoted it back to Professor. I was more off, before, but now I'm 2 off. I hope to be able to find the 2 steps (for 74), occasionally. Already giving 5 stars, cause I think it's a very good puzzle!
EDIT (a few hours later) I found the 2 steeeeeps! :D :D :D :))) GREAT level, indeed! (and currently demoted to PhD, again, LOL).
Makes a lot of sense after solving GigaChad Defence. Not sure why it took me so long to see, I was trying the right path from the beginning but somehow I was doing it wrong. Tough set of levels!