You could try using a thick spine to support the middle section of the non inverted loop and another thick spine on the roll below them, so you really only have to use 1 support and that would be on the center of the sidewinder and then you'd have the rest off to the side.
Not to be Robb Alvey, but that looks super twisty. I like the shaping on both maneuvers. 3rd picture seems to suggest some Iron Shark latency in the roll.
I don't know about the supports. Track looks great and Gersty but the supports look neither great nor Gersty, I would say. I probably think that because Gerst usually sticks with individual support structures rather than core structures that branch off to many spots.
Though the support work is fantastic; I have to agree with Gerstl. It looks more Intamin and Premier-like than gerstlauer. Phenomenal looking ride you have got there.