Bailey minus a couple big drops is primo class IV/IV+ if thats what you are looking for, and there is a lot more class IV in bailey than in lower south boulder. Pine creek granite is lots of III/IV with one V, not really IV+.
Count, I totally disagree with the comment that OBJ and Daisey are not harder than gore at normal levels. Many people who go to gore for the first time portage tunnel and gore and the rest is class IV/IV+, maybe kirschbaum is V-. OBJ is class V. Drops are huge as are the consequences, its a totally different ballgame. If you are running class IV and looking to take things up a notch, OBJ is not the place to go no matter what the water level is in my mind. Just my two cents.