1)err,actually i haven't heard about the 60% claim, but i think it's
defense+ .defense+ is a smart
HIPS, it can detects malicious activity without using malware signature

2)

i'm so lucky that i can use all of them (CAVS,CFP,BOC,CMG). (but i replace CAVS with avira -
antivir since i already have defense+ HIPS). i don't know much about this, some ppl report
that they have trouble using these products, but i didn't notice any problem

i think maybe you
should use CFP & BOC. and use another AV instead of CAVS for now.
3)i don't follow this question

all i know CMG will prevent Buffer overrun (further explanation
about Buffer overrun==>WIKI

),nothing to do with HIPS. i think HIPS (like defense+) is like an
"anti-exe",it monitors apps that about to execute and give us some explanation & option to
allow/block it.

Ganda
edit: oh and about your topic title, maybe you should just delay your plan to install CMG and wait for it to be integrated with CFP, so you can use BOC.