John, the jasmine tone to the fragrance sounds pretty special. Sorry to hear that the heat is shortening the bloom's life. The plena floras seem to take a long time opening - it's a shame if they don't last awhile once they finally open.
I have a double orange seedling that bloomed last year for the first time. It is now opening its first bloom for this year...the inner skirt was starting to drop today & the color is beginning to fuse in. It should have it all together either tomorrow or the next day. Fragrance? I don't know - it will take a step ladder to get up high enough to sniff the bloom!
USDA Zone 8b
Heat Zone 3
Sunset Zone 5
SeaTac, WA...one cool place