images completely wrong size in gallery

http://wordpress.org/support/topic/theme-ten-eleven-is-resizing-large-images-wrong

Using 2011 theme. Found all pics were being downsized to 584 wide. Found
http://wordpress.org/support/topic/theme-ten-eleven-is-resizing-large-images-wrong

Added child functions.php
$content_width = 900;

(My content area is about 800px. I added a scrollgallery 900px which was using the 584 size before)

Then noticed all my tiled galleries were random. Found this

http://wordpress.org/support/topic/why-are-my-pictures-getting-cut-off

Looks like my issue but fix didn’t work. All files in tiles have url ending
jpg?resize=891%2C1255
only last char after ‘C’ changes

Removed $content_width and found it was no longer cut off. But some tiles show larger than 100% of the pic.