I use big gun and it's pretty comfy. You definitely want some 'big wall' harness...
This one is even comfier:http://www.backcountry.com/metolius-wal ... mhhcm5lc3M
yeah and no problem if you want to undo your CL and run it through...It's actually my wife's setup on big gun. U can choose the distance by running it just through that "grey/orange" loop (or both) or you could follow them all the way through the harness if you have big CL (QR could not work that well with some small chicken loop set up this way though, so just test it!!! )
I have no problem with carabiner but I'm 200cm so probably longer arms