Too much space and getting rid of comments in Sliding Door Theme

For reference, my page is: https://baroquepainting.com

In Sliding Door theme, I got rid of one of the photos at the top, making it narrower. I kind of randomly reduced the widths in the stylesheet to get my title graphic to center over my sliding door images.
Problem now- my text on my pages extends too far to the right.
Also: There seems to be too much gap (padding) between the left sidebar and the main page/column.

My second lesser problem- I want to get rid of any timestamp or link to comments under my posts. I’ve accomplished this on my ‘pages’ but they are still under individual blog posts. I don’t want them anywhere.