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Hi,
besides those three species that you mentioned, there are three more given in the "Checklist delle specie della fauna Italiana":
Trichocera (Saltrichocera) annulata Meigen, 1818 (S, Si)
Trichocera (Saltrichocera) parva Meigen, 1804 (S)
Trichocera (Saltrichocera) saltator (Harris, 1776) (S)
All those three species are widely distributed around Europe, so I am sure they should live around Padua as well and should be considered as an option.

Moreover, there are four other species known from Italy and should also be considered:
Trichocera (Saltrichocera) hirta Starý & Martinovský, 1996
Trichocera (Saltrichocera) mutica Dahl, 1966
Trichocera (Saltrichocera) pubescens Starý & Martinovský, 1996
Trichocera (Saltrichocera) rufescens Edwards, 1921

Your last picture of the male genitalia is most probably that of T. S. annulata, but the earlier images of female ovipositors are not distinctive enough to tell the species. The problem is that females of several of the mentioned species are not know yet, so we can't be sure about what we see.

If you collected those trichocerids or any others, you could send them over to me for closer identification :)