i use comfort bridles with padding over the poll and around the nose band and a little more shaping around the ears too.. happy with them. i like the horze comfort bridle and the ones in the weatherbetta/bates catalogues.
This sounds potentially a dangerous situation for you.. it sounds as though being on the lunge is triggering her flight/fight reactions.. could it be that she is fresh and full of energy so using these sessions to let off steam? or. do You think she is genuinely scared of the lunge line.. being...