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I think Jellby is on the right track. ZIP compression will do very little if any actual compression on a JPEG. The trick will be to reduce the size of the JPEGs before creating the CBZ/ZIP.
If you should choose to use Photoshop, you should NEVER EVER use the Ps option to "Save as..." to create JPEGs for any CBZ, eBook, or web use. You should only use its "Save for Web and Devices..." option. "Save as..." embeds a whole plethora of Ps specific ancillary data (guides, ...) in the JPEG thus bloating the size.
"Save for Web and Devices..." will not do this and offers additional options to strip even more metadata. As a result it will produce substantially smaller JPEGs when using the same quality settings.
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