Not so sure I agree with tip helping with heat unless used with pcv. I would think tip alone would make it even more lean and run even hotter. Am I wrong ? If I am correct then tip is not the fix. The pcv is the fix or at least a step toward a fix.
I believe you are both technically correct, but the exhaust tip doesn't flow enough to make a dramatic enough of change in leaning or cooling to be concerned. Now if you tossed a full open pipe, twin silencer exhaust on without adding additional fuel, you would see a serious leaning issue. Both the tip and powercommander are nice additions as they complement each other, both adding little power/cooling/enriching, but both adding up to something larger.