I have an issue getting my CG pushed forward also. I moved my entire engine forward about 2mm using washers behind the engine mount. The instructions call for some washers to get the right/down thrust in line (it looks like you have them in the picture), and I added 2 additional washers on each corner to push the engine forward. This gave me the CG I needed, without adding any additional weight. I'm not sure this would work for you however because it seems like you have ALOT of extra weight. You could however shed "some" of the weight with this method. Then again, if it flies OK, then you may not mess with it.