Hmmmm. Not sure I understand the Q, are you contemplating changing the thrust line to compensate for the T-roll in hover?

If that is your Q then my 2 cents is no, absolutely categorically no. Don't chg the thrust line. That will alter your pitch or yaw moments (depending on the change) and CREATE problems without having any effect at all on the torque roll issue !! Cutting open an orange with an apple slicer...just a big mess.

I agree w/ Freak. Swap out props. Experiment. I love my APCs. Try an 18-4 if they even make one as the S-180 can swing it just fine. Then a 17-6.

let us know how it turned out!!