I would guess then that your fueling is off some. In your tune, if it has overheated enough times I would also suspect head gaskets. Someone else asked earlier about the bypass line for egr cooler, you did add one and not just block it off correct?
Also be prepared to swap your Mishimoto radiator out in about a year or less. Anyone looking to put a Mishimoto radiator in needs to search the forums. They are junk. But anyway hope you have your issues resolved for now.