Like cc has said, no problem with sensitivity when using the method for carp.
The secret is to ignore the "knocks and tweaks" and wait for the pull - when the rod gets wrenched round and you have to dive for it! And they all get lip hooked!
I used to use the Korum feeders but have recently changed to the new Drennan ones as I like the plastic connector which does away with swivels.
Regarding the rig, I always like to use a short (3" max) hook link of strong mono.