Probably more rigorous DIY is needed by replacing the whole metal-plate (and fasten the Tower in a different way).
I would probably go back to the old mounting method for the heatsink plus separate VRM heatsinks, I suspect that will provide a better setup since you can get better contact with the individual VRM heatsinks.
Hey padrino, can you point to a link for this method, for those of us who don't know "the old mounting method".