Couple of thing to check , Cg a nose heavy model will require
more speed to ROG. next check model is sitting level or slightly
nose up . Flaps I use half to get off the grass field
but it get's up quickly .
lastly a EDF is far less efficent that a prop plane and you
don't have the propwash over the control surfaces so its
going to take more speed - runway
hand launching . be careful .