Well if I'm reading this correct you went from regular nvi to limited ingredient nvi which is going from lots of protein n fat from meat to much lower protein n fat n a lot less meat n other things. The nvi Li is some meat tapioca n canola oil. Would probably account for the different stool amounts. Their body adjusting to the different food. As for the hard stools u have been given lots of good ideas but more water in the bowels is the idea. I give canned food which has more water content then dry to help with stools. Good luck