Struggling with image guidance

So I think I'm following all the...guidance about image guidance, but I'm not quite getting the results I need, and I'm wondering if I'm doing something wrong or if it's just not possible to get the precision I'm looking for.

More specifically I'm doing a scene to scene storyboard, and so naturally I need the subjects of a scene (a ship in this case) to look exactly the same as it did in a precious scene, but each prompts generates different (sometimes very different) results.

So I'm using cinematic kino, image to image for guidance, strength is generally between .25-.40 (anything more just seems to not change the scene very much at all), but the ship always winds up looking different.

Is this a settings or a prompting issue? Is there a way to specify that the subject should be and look exactly as is?