It's an interesting question...and like most things on a boat, "it depends". If I am racing, I tend to carry more canvas than if I am cruising...and please note I make no claim to be an expert - indeed, I will be interested to see what others say. Always learning.
In general, in winds roughly 10 knots and below I use my genoa - about 115% in my case. 15-20kn I use a 100% jib; but at the higher end, the main may be let out to depower, or be reefed. 20kn up I use a blade - 90%, flat-cut headsail; I also consider reefing, almost certainly if cruising.
Around 25kn I have been playing around with the blade alone. As you know, the 323 is very headsail driven, so she performs surprisingly well with headsail alone, pointing as high as with the jib+main. If you have not tried this, I encourage you to do so. It has surprised more experienced sailors than I.
As we get to 30kn, I am normally double reefed, main alone. There are often gusts 5kn-10kn above this, and with the main alone this feels maneagable, even though it may be difficult to let the main out during a gust (due to the pressure).
So in general: I try and align the jib with the anticipated wind conditions, and adjust the main (reef/luff) depending on that the conditions actually are. When overpowered for a short time, I let the main luff; if I think it will be a longer haul (or increasing wind) I reef. If in doubt...I reef. Easier to shake a reef out than put it in.
Hope this helps!