Just one more thought: I personally find those "award" schemes rather patronising. My company had a particularly cringe-making one recently, encouraging pax actually to hand little gold hearts to crew who did a good job..! Come on, we are not in kindergarten! Nor, in my experience, do the in-flight survey forms or the regular send-outs count for much, being badly worded, ambiguous and largely irrelevant.
What does carry weight, and how, is the one-off letter, especially from regular pax. So if ye have pens.....