Winds calmed down a bit today, so I got another chance to play with it. With the wing extentions it is much more floaty and susceptable to variations in the wind. The extra length also seems to make it a bit harder for it to level out of a turn without losing a lot of altitude, making it difficult to control in anything but absolute still conditions. They may just need to be trimmed back a bit--hard to know what length is best

Regardless it does fly, it's faster, it gets higher, it's just kinda tricky.