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If it were me I would be looking into the transom damage. The only reason people add metal sheets as you describe is because the transom is failing. This is usually due to core rot. The problem is by adding the sheet you redistribute the weight. As the boat flexes this creates an issue as the metal is more rigid than the fiberglass so now you have this piece of metal with a motor attached to it flexing the fiberglass transom that is already weakened by rot. Adding a second sheet on the inside is only going to compound the problem. If it hasn't already started the flexing is going to tear and deliminate the fiberglass. One day this will completely fail.
Why don't you take the time and cut the exterior laminate free from the core. Replace the damaged core and rebed the laminate? On a little Whaler this is a weekend project. It will look better and you won't have to worry about your outboard motor falling off the back one day.
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