thornhillguy - The Column Grid mod only applies to the product listing page, not the all products, featured, etc.

Develop&Promote - There is code in product_listing.php that sets the width of products based on the per-row setting, or the total number if less than that. You could disable the alternative calculation to have say 2 products aligned to the left. Search the forum to find where this has been discussed before; I will be back later if you still need help.