Did you get the Laser 200 for your Ryobi? If you can build it to 11 lb with the Ryobi, your cubic wing loading CWL = 15.2 which is high. I put a Ryobi 30 cc engine in a .90 sized plane that was about 744 sq in in area and the CWL was 15.0 and it flew.

A CWL of 7 is a floater so at 15, if your engine is not running right, you will struggle to take off. On my first flight I made it into the air but because the engine was not run-in, it sank and I belly-flopped her in. Broke the fuselage in half.

I glued her back together and popped a 20x8 APC trimmed to 19x8. She took off and flew well until flutter removed my left aileron. With the heavy wing loading, I could not keep her in the air.