It looks like you got cut foam cores down. I have heard cut cores are more uniform and less likely to have the weight variance molded cores have. I am planning on ordering a couple of pair Ace cores soon from vendor on Ebay for my Sunday Fighter project. I also have an old ACE R/C Simple Series Staggerwing kit to build too.Right now I have been working on a VK DR.1 project and a Top Flite 182.