I am not sure whats going on here,people are very uneducated..
The Moki 180 weighs about the same ready to fly and puts out similar power as a good 40cc gasoline engine.I think this is an indisputable fact.

The Moki will easily fly all the planes mentioned.I cannot help with the CG question.It should however be easily resolved by shifting components about.A 25% is a proven Moki 180 combination.