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I would say that if you are moving when trying an exit technique you are either not deeply enough in the trance (to where you should be almost paralyzed, unless you have a lot of experience) or you need to practice 'energy body movements' as part of your practice (not while you're actually doing the exit attempt)- this is where energy work helps, btw- Exit techs are not the issue, because there are many kinds that use different approaches (active, passive, mental, tactile, visual, bla bla).
So I think your trance must be deepened to almost asleep without loss of awareness. As to energy/ body control, there are various exercises that can help; for example:

Sit in a room and mentally walk around it. Walk to the wall, put your mental hands on the wall, feel the texture. "See" it in your head. "Walk" to the side on the right, trying to recreate how the place looks. This is harder than it sounds, you will find that you're fighting your urge to move, but it's good training.
An easier version of this: Sit comfortably in a chair, eyes closed; do light energy work on your arms and legs, to determine where your limbs are in terms of your awareness. Then move your mental arm up slowly and deliberately, making sure not to move your actual physical arm. Do this with both arms.
There is something that Moen teaches (I think it's Moen, it's been ages since I've read about it) called the 'Silly Little Finger' exercise. This doesn't exactly do what the previous exercises do, but it gets you in a 'ready' mode without moving anything physical and can be part of your practice if you assign a place for it and keep it consistent, like a ritual.