I'm fairly new to all this so I don't consider my opinion as an expert one as you asked but here goes anyway. I dont know your setup all that well but what I do know from my scope and camera is that the focus points between my EPs and my camera is vastly different ( my camera being setup on primary focus ). Sometimes I will do the same process, find and look with my guide and EP then drop the camera in and I can't see a thing. Some number of turns later on my focuser and it starts to come into veiw. Through many hours of practice I know roughly the number of turns it takes. Then in addition I set the object I'm looking at as a custom object in my go-to so that it stays in perfect veiw.
I hope this helps
Also I might add, and this comes from even less experience, 0.1 secs will not nearly be fast enough as newtonians gather heaps of light. You'll probably find that you'll get no detail in your pics. They'll just look like a big bright round ball. Again, I have no experience with your camera but I know with mine I need at most 250th of a second and the lowest iso possible. I'm assuming in your program that is " gain "