This is why CGW, doesn't sell a reduced power sear spring.
Seriously. I ordered and installed CGW's .020" sear spring for my P-07 before I even installed their hammer, not because of hammer follow, but because the other mods and break-in had already made my SA scary light. I needed to get my SA pull back over 3 lb to feel safe about it.
I haven't worked with any MCarbo kits, but I did watch their installation video, like I watch all full disassembly videos of P-07's or P-09's I can find on YouTube. When I saw that they were installing a reduced power sear spring, I was like... what? I wouldn't be against trying one of their kits in the future, but reduced power sear spring is definitely one of those parts I would be leaving out.