Nofollow has changed a lot.
10 internal links. 10% juice to each page. I nofollow 5 of them
Before: 20% juice to 5 of them (those dofollowed) and 0 to the other 5.
Actually: 10% juice to 5 of them (those dofollowed) and 0 to the other 5. The remaining 50% just vanishes.
Result: don't try to sculpt PR, is not the best thing you may focus your efforts. Better focus on the new panda update or external linkbuilding.