Ahhh I see. Cut the throw down on low rates or don't pull so hard at first. Add some power just before pulling. You are changing the angle of attack to much for the wing to hold on.

This design was pre-3d so it will really take some work. It probably won't pop to vertical like you want. Practice different power settings (low) and change how much elevator you pull till you get something close.

Good luck

V-Snap