Well, afaik increasing the voltage is overclocking -> for better performance. So logically decreasing it would be underclocking. Perhaps you didn't "feel" the difference, but I'm quite sure a benchmark will.
I don't really burn dvd's a lot, mainly for testing images ( linux / osx / windows ) so I don't need Toast -> I'm keeping the RAM

I'll try the skge.kext tomorrow with leo4all v3 with JaS patch ( I really hope it'll resolve my kernel panics).
By the installation guide, you mean the stable osx guide?

Btw, sorry for the unnecessary quotes.