Hello gurus, masters, developers...

I am using Red Passion template, IH2, Lightbox.
I have a problem with product listing.
Let me show you the screenshots rather than trying to explain with my rough english... show mercy please

1. Nice gap between products when Image Handler resizing is disabled:


2. Image Handled resizing enabled. No gap and gets ugly when certain images are fused/joined together:


You may disregard first test item's cell because it is extended by the large "Free Shipping" image.

How can this be avoided? Even if the cell size has to be hard coded as I do not intend to swith template.
Please note CSS and PHP are not among the languages I understand, however I am OK with basic HTML and can do some light modifications if any suggested.
Is it actually IH2 or it is template issue?

Thank you.