I used the YJ lines for three years until a recent project made them too short for my Jeep. I have a table made
http://www.grobe.us./Jeep/Tech/Drivetrain/Brakes/rubberhose/ExtendedBrakeHoses.htm that says the YJ lines are only 2.5" longer than stock Cherokee.
Oddly enough they worked fine on my 4" lift with long arms. Another thing that you can try is moving the hard line further down the frame. You can gain an inch or two that way, although I haven't ever done so myself.
Ultimately the YJ lines are a good choice for your size lift.