Best to fly on as low a throttle that you can manage with (on the hi-wing trainer of course), so you get used to the sensation of gliding. Thats what my instructor did. SO when I had my first deadstick, I calmly landed the airplane having never landed before!

Practice on a simulator as well, its a great idea for new pilots.

Your instructor may want you to get used to the model being very reactive at full throttle. That or the throttle is not set up properly and what you regard as full throttle may actually be less than that. Ask your fellow fliers for advice

Ameyam