Dusty/FFF/Carb
Adding half the gust component is a heavy technique, that works really well in big iron
BEagle (who has forgotten more about flying than I have learned) made a very good posting a month or two ago about approach speeds - may be worth a search if you are interested.
If you are concerned about being on the wrong side of the drag curve, why don't you try steepening your descent a little and using less power? That way you add to your potential energy if you need to call on it. By the way, where is the back of the drag curve in your aeroplane? (In mine, it is not at POH Vref, with a 5 degree glidepath.)
BTW, I own a share in a Pup 100 and agree that there is little if any redundant power, but I've always managed nicely at the figure in the POH, even on gusty days.
Obviously, everyone is entitled to their opinion, but I don't like arriving fast over the threshold if I can possibly avoid it - as it means that my approach is not stabilised.