The strange thing is, the code tries to raise the limit itself: https://github.com/moodle/moodle/blob/master/question/format.php#L876
See if you have $CFG->extramemorylimit set, and if not, set it there. That way, the extra memory is used only where needed, not on every page. (https://github.com/moodle/moodle/blob/master/lib/setuplib.php#L1235)
See if you have $CFG->extramemorylimit set, and if not, set it there. That way, the extra memory is used only where needed, not on every page. (https://github.com/moodle/moodle/blob/master/lib/setuplib.php#L1235)