Robarco,
Refer to my comments in relation to Tulip species for 'warm' mediterranean climates. I too garden in a warm climate with relatively warm winters, seldom falling below zero degrees Celsius. I have found that I can expect very few of the large trumpet daffs to repeat. I suspect that in the case of the daffs it's more complex than winter chill, there is also an element of time post flowering for bulbs to store carbohydrates and complex starches for the next year. Put another way our spring slides into summer too quickly to allow the bulbs enough time to store food for the next season. I have found that the earliest flowering daffs, here things like Welcome and Robin will persist over a few years but I lose them in years when we get very dry spring weather. I have found the smaller narcissi species which you mentioned do well as well as, strangely, most narcissi species with a little N. cyclamineus blood such as Jetfire (a lot of commercial stock now virused), Tete a Tete and so on. N. February Gold and February Silver are the largest I can get to repeat reliably. Quail and Little Witch also are reliable for me but are smaller flowered species.
I continue to buy a few dozen large flowered early daffs each year so I can enjoy them in late winter. I plant them in plastic pots, put them inside prettier planter pots to admire while blooming then give the bulbs to my brother in law who lives at a slightly higher and cooler elevation, to plant out in the garden as they will relower for him in later years but just present me with healthy leaves.