I'm not clear if you're talking about the product listing display of product info, or that actual product information page. If the former:
I use height: instead of min-height: in the includes/templates/responsiveSheffieldBlue/css/stylesheet.css
For my set up I split out .centerBoxContentsNew, (and Featured and Specials) on stylesheet.css from .centerBoxContentsProduct at approx line #268. For .centerBoxContentsProduct I left the styling except I change min-height to height:480 which gives a contant product listing box regardless of image size diffs
But 480 is too big for my .centerBoxContentsNew,(and Featured and Specials) that display on the front page, as I have fewer fields turned on to display, so I put those in their own line. I used the same styling as .centerBoxContentsProduct, but used height:375
In both cases I used a height that would be the maximum I would expect. That gives me some flexibility in image size and accommodates a title overflowing from one line to two. I fiddled back and forth with different sizes to get my final size. And checked appearance via chrome developer tools to see in tablet and mobile views.
So far I'm still in test site so can't show you live version.
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