I go into a good bit of detail on front/back pulse here: http://www.pblegion.com/showpost.php...25&postcount=8
The long and short of it is unless you have a compelling reason to change the back pulse, you should leave it alone.
The benefit of the CP trigger is a.) that it is physically lighter than all other triggers and b.) that the second gen ones (most common) lopped the 'tail' off where normally there'd be a post-travel adjuster screw. Not only did this further lighten it in weight alone, there is uh, it's been a while since physics, centripetal force in each trigger pull. In the end it really does feel 'nice'.