I replaced an old OS .40 FP in my Tower .40 trainer with a .46 Magnum and have a few questions. I have moved the battery back behind the servo tray in an attempt to get correct CG but it looks like I still need a few more ounces of weight. Where is the best place to add weight and does the battery need to be in foam? I was thinking about velcoring the battery directly to the fuse floor.