So sad to see you got roped into that Master Set BS. What a load of baloney! Speaker setup is so simple. Leave it to this clown to make it IMPOSSIBLE! lol!
There are two separate yet related aspects to speaker setup. First is to find the location that gives you the best balance of bass response. This means moving them closer to or further away from the walls in order to find the smoothest/deepest response in your situation. This involves zero listening for imaging, it is all about smooth response.
Next is what you want, imaging. Use a tape measure to ensure the speakers are precisely equidistant from, and symmetrical to, your listening spot. This all by itself will give great imaging.
Finally, adjust toe in to achieve the desired balance between image focus and sound stage width and depth. Pointed directly at your ears image focus will be max, super solid, and deep, but not very wide. The less toe in the more the stage will widen, but there will be a tradeoff with depth and focus.
It really is that simple. Do not get distracted by BS claims of imaging all over the room. Physically impossible. The best that can be said of this baloney is the imaging can be equal all over the room- equally bad!
By the way, none of the stuff you are talking about matters. Someone tells you how many feet apart their speakers are, that means nothing in your situation. Your amp, cables, music- irrelevant. All that matters is your location relative to your speakers. When that is equidistant and symmetrical you will have the best imaging you can get with your setup. Period.