hi again shaddow !! as we have the same model ..(see in forums that they talking http://www.flyinggiants.com/forums/s...odel+sbach+342)
(http://www.rcuniverse.com/forum/m_99..._1/key_/tm.htm) (http://www.flyinggiants.com/forums/s...ad.php?t=55352) in your manual says that the cg is 5 1/2 in from the leading edge and says also 132mm ( but 5 1/2 '' is 139mm ) now ..all the planes of that kind the cg is on the wing tube/// that is if you measure 12cm =120mm and if you read in the forums that i have post to you say for tail heavy and that the cg is better from 12cm to max 13cm!!!!!! ..( with the lighter engine DLE30 ) AND That they need to put weight 280-360 grm to have a good balance ..but you have a 200-250 grm heavier motor from dle30 so i think your life is going to be more easy with this model ....and only to play a little with the battery place to have the perfect spot ......
12cm is on the wing tube....others say just behind the wing tube.....and as you can see in the forums say that in the recomend by manufacture cg 5 1/2 '' was way tail heavy and problem to land!!! also put expo (30%-40 % ) in elevator also they say ..that it has to much responce
good luck !!!!
and post your report from your flight[8D][8D]