After balancing the paper, you can dial in an extra 60 yellow and 40 magenta instead of placing a strip of C41 leader in the path. I've tried to find my notes, but its been several months since I last printed any color or experimented with the RA4 interneg. I committed to a couple of print exchanges and a negative exchange and so I've put all my time into those for now. After reading the recent post to this thread though, I want to go back and try the RA4 reversal again.