While your VGT numbers may not be textbook they're certainly not bad at all. I would check boots for cracks or leaks at the clamps...maybe check the hose going to the MAP. May even be not having a perfect seal on the up-pipe to turbo seal. If all that is fine and it keeps kicking out the code I would then pull it and check the unison ring/clean the turbo. Check out Diesel Tech Ron's videos. He made a few on the turbo which should really help you figure things out.