Hello,
We recommend you to remove that spacing in the cell to be able and also use the following options available in addImage:
* 'relativeToHorizontal' (string) margin (default), page, column, character, leftMargin, rightMargin, insideMargin, outsideMargin. Not compatible with inline text wrapping
* 'relativeToVertical' (string) margin, page, line (default), paragraph, topMargin, bottomMargin, insideMargin, outsideMargin. Not compatible with inline text wrapping
As this is a very specific question, we'd need to check how you are creating the table or the template you are using. For this case, we recommend you to open a support ticket (https://www.phpdocx.com/support) with a template and code sample and the dev team will check them and generate a custom code to illustrate how to accomplish it.
Regards.