Yes, I have a Radian XL. I give it about half throttle with a little up when I toss. Once I have both hands on the transmitter, I raise the throttle and head up. The Radian is too heavy to go up at a steep angle

Make sure the CG is where specified. Mine balances with. 3S3200. I am sure everyone has different techniques but I climb as high as I can for one minute, cut the throttle and sail around. Once close to the ground I go up for another minute. I do this one more time and end up with 10-15 min flights.

The tip above launching with motor off from a small hill is a great idea. We used to do that with all our rudder only planes in the old days. Just launch it level

Have fun

bob