Image compression workflow with Hazel & ImageOptim wont work

Hi
I am trying to use Hazel to automatically compress images in a special folder, rename them and then move them on to another folder. So far I got everything except the compression part up and running. ImageOptim should be a great tool for this (as it is able to do lossless compression), however if I select I select "open with..." and ImageOptim in my Hauel workflow, it compresses only one of the images.
Maybe someone knows a solution to this (pretty basic) problem?
Slightly off-topic: There also seems to be a version of ImageOptim called ImageOptim-CLE, which I would try but I am not sure how to use.
Many thanks!
I am trying to use Hazel to automatically compress images in a special folder, rename them and then move them on to another folder. So far I got everything except the compression part up and running. ImageOptim should be a great tool for this (as it is able to do lossless compression), however if I select I select "open with..." and ImageOptim in my Hauel workflow, it compresses only one of the images.
Maybe someone knows a solution to this (pretty basic) problem?
Slightly off-topic: There also seems to be a version of ImageOptim called ImageOptim-CLE, which I would try but I am not sure how to use.
Many thanks!