Cm870 550 hp egr problems

[808allstarr]

I just had shop swap ecms from a 475hp to mine which is supposedly 550hp and flow tested cac and there was a big difference in water levels and truck even idled smooother. Another possible problem that came up was when head was changed it was timed according to engine data plate but was wondering if with the higher hp program 550hp that wasnt what it needed to be being that maybe higher hp tune needs a change in timing?