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3D Printed POWERUP 3.0 Plane Weird Flight Characteristics (First Post)

Hi. I'm new to the Flite Test forums but I've been in a few others before so I have some experience. This post is about a video I made on my YouTube channel here:
I'd like to talk about some weird flight characteristics I experienced with this plane. When I first threw the plane it would immediately bank around until it was upside-down and then stop spinning and go into the ground. I managed to make them less noticeable by giving the plane an absurd amount of dihedral and making my vertical stabilizers bigger. But what I want to know is why it goes upside-down in the first place and how to prevent/fix it in the future without sacrificing lost of lift from the dihedral. If anyone knows something that can help please let me know. Thanks!