If you want to tame the plane down so it flys more "normal", you could move the tail back a distance that you could decide from studying similar planes. One way to do it is shown on http://www.rcuniverse.com/forum/m_6735417/tm.htm. It is then common with SPADS to move the wing to get the CG location you need. I suggest that the MODERATOR move this whole topic to the SPAD section.