I don't care for Diletta. In away, I like the sound of Dilecta better, but since it sounds like delectable, it is not really usable. Several of your combos are very nice, and I like your middle name choices. In stead of Diletta, how about
Delfina,
Delaney,
Delora, or
Delora?
Of your combos, my favorites are:
Diletta
BeatriceDiletta
ConstanceDiletta
FrancesDiletta
LeonorDiletta
Sophia