I do 2 actions to do that.
First action resizes the smallest side to the size I am aiming for (your case 150), then have it place the crop "box"(150x150) on the pic.
From there I manually move the crop "box" to my desired position.
Second action is just a crop and save then close the pic.
This is the only way I have found to get a crop that I want from each pic.
kind of a pain but worth it.
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