Can an Electro-Permanent Magnet Work as a Temporary Lifting Device?

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An attempt was made to create a temporary lifting device using electro-permanent magnets placed between iron plates with opposing poles. The theory suggested that removing one magnet would allow the workload to close the field line path, generating a lifting force. However, the experiment showed that the force produced with two opposing magnets was only slightly less than with one, indicating a failure in the intended design. The discussion seeks insights on potential errors in the setup or alternative approaches. The goal remains to develop a functional magnet parts lifting device that can be effectively turned off.
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So I am trying to come up with a magnet parts lifting device that can be temporarily turned off

Their theory was, take two magnets (7x7x1.5mm in this case) place them between two iron plates with opposing poles and there should not be any field lines leaving the iron.
Take away one of the magnets and the work load closes the field line path, exerting a force

Well it did not work, with two opposing magnets present the force is only slightly less than with one.

Any ideas where I went wrong?
 

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this is exactly what i had in mind
 

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