another thought then - -if applying power makes it climb --which translates into a left yaw - you possibly are tailheavy and or need more "down" control in the horizontal stabilizer -either reset the stab (LE up) or increase down throw on the elevator(s).
Bipes can be critical to stall - especially short coupled small tailplane setups .
The full scale stuf like that can be a handful also .
for a really easy to fly bipe - something like a Bucker Jungemann setup is far easier - not as interesting perhaps but far more stable .