Interesting pic but that collimation is frightening.
I hope you can figure it out.
I had to use a Takahashi Barlow with my laser collimator to
reflect a black paper re-enforcement circle from the primary mirror back to the laser window
to get my 10" f4 right - then it was easy.
My Baader RCC was already set to the right length from my previous telescope.
https://www.flickr.com/photos/247194...in/photostream
cheers
Allan