X45 Laminated EPP flatplate delta flight

Just doing some flying around. Finally resolved why takeoffs and slow flying would stall. I had rounded the leading edge of the forward half of the wing with wooden dowls but left the rear halfs flat - this is a 9mm epp flatplate. On takeoff the delta would roll left then right terribly until I got some speed up. So I rounded the rear half leading edges with dowls and problem went away. Now this is a really fun and easy to fly flatplate.
Also I cut the elevons down in an attempt to solve the problem but it wasn't due to too large elevons and now wish I hadn't cut them down.
I plan to make a slightly larger X45 like this but with an airfoil.

X45 EPP Scratchbuilt Delta Wing flight (3 min 29 sec)