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What heat rating are the plugs you're using? I had the same issue when I got my KA-T S14. WOT would cause a lot of bogging and black smoke, max psi was usually about 4psi, out of a tune meant for 16psi. Originally my wastegate flange was warped, and the gasket was blown (2-point flanges are dumb, btw) and I fixed it, which managed to get me a couple more PSI of boost. Then changed my plugs, and went up a heat rating from 6 to 7s. Instant fix. So, check your wastegate for proper plumbing, and seal around the exhaust side. Then try upping your plug heat range if that doesn't work.
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