>>11354061
Ancestral doesn't take more steps to converge than regular euler does. Whether you start from step 0 or 20.

>>11354062
As soon as the resolution changes even by one pixel, the seed results in a completely different noise pattern. And upscaling changes the resolution, so no it won't help. But won't hurt either.

>>11354052
>is there a way to "zoom out" and fill the border when a picture is cut off?
It's called outpainting. Not sure how to set that up in webui but you should be able to find a guide.