I put in the elevator and ruder servos in the original positions. I only had to put 3ozs of lead in the nose with a YS 63s four stroker. With a os 91 it should be just right. I did end up putting two servos in the wing. Heres my build thread if anyone wants to check it out...
http://www.rcuniverse.com/forum/m_33..._1/key_/tm.htm