I don't think you need to change and/or tweak anything.
As far as the sideboxes go, I'm of two minds.
first with the sideboxes off on the product info page, If they add the product to the shopping cart, they are taken to the shopping cart page which will have the sideboxes and they can then select from the categories. Kinda like, "I picked this product and I don't see any chance to look at something else; I might as well go ahead and put it in my shopping cart."
second, You might be right, and go ahead and give them a chance to change their mind about this particular product.
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