Got another suggestion for you. For launching, take a picnic table and fold one end and tilt the table up to an angle of 30 to 45 degrees. That way, 1/2 to roughly 3/4 of EDF thrust will help lift as it leaves the table.
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Important thing to remember is as it leaves the table, the torque will rotate the plane. Since you don't have rudder, you need to counteract it with your elevons. By using the table method, it eliminates the time delay of throwing the plane to putting your hand on the elevon control. At fast speeds, it will mean a "save" from diaster.