Make sure there is no layout update on simple products. Either apply to the configurable product, but this can copy over to the associated simple products and takes time to adjust.
Instead hard code the template into "your template"/layout/catalog.xml. Will be located just under
<label>Catalog Product View (Any)</label>
Just change the template tag to your desired template.
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SOLUTION:
Make sure there is no layout update on simple products. Either apply to the configurable product, but this can copy over to the associated simple products and takes time to adjust.
Instead hard code the template into "your template"/layout/catalog.xml. Will be located just under
<label>Catalog Product View (Any)</label>
Just change the template tag to your desired template.