I really dont see much in common with an f4i...
Just FYI, Enjaye, the "i" in F4i, is for injection, as in fuel injection, so definitely don't look for any comparisons there.
I've never owned an F3 - the only "F" series CBR 600 I've had is an F2, and there might be differences that I'm not familiar with.
It is common, on a lot of kits, to have one larger main jet set, and an assortment of smaller sizes, since, believe it or not, you'll get more power on a STOCK bike, by leaning out the top end.
I think others have gotten most of your questions answered.
For what it's worht, I've always only used Factory Pro Kits, which don't require any plugging and drilling of slides and the like.