That really sucks, but beng that the vuteq is polyurethanes there is little you can do.
One thing I think would be beneficial for you is to use a thicker 3M double side tape kind of what the 98-02 TRD kit uses. This will allow you to fill it in better.
The 3M tape has to be .060 inches thick acrylic foam tape.
This is a link to their website:
.060 3M tapeMost of the tape found at bodyshops and peps boys is .045 inches thick, but fot these type of kits you need .060
Do a search in google for the part number and I am sure you will find someone that sells it.
Give it a try and see what happens. It may fill up the gaps very well.
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