I do not mean to bother you, but I think you make a mistake here:
From http://www.earlychristianwritings.com/luke.html (emphasis mine)A date for Luke-Acts in the 90s of the first century or first decade of the second would account for all the evidence, including the alleged use of Josephus and the apparent authorship by a sometime companion of Paul. If Luke did not use Josephus, a date in the 80s is permissible.
Aren't you forgetting about Josephus' Wars, published before 80 CE?
Also here I have an objection:
Why do you accept, rather naively, that "Luke" wrote his/her gospel for a patron, a VIP named Theophilus?The explanation could be very simple: after twenty years, Luke had received a copy of Mark's Gospel and decided to write his own version of the story, putting things in order (over against the "many" who have written before him) based on his own investigations, in response to the prompting of his patron, most excellent Theophilus.
What to we know about Theophilus: nothing. No proof he existed. You objected forcefully about me opting for Jesus or Joseph, of both, being carpenter, but you do the same for Theophilus.
I stated my view already on that matter: Theophilus was a trick, just to indicate you don't write lies on something (pretending to be) historical to a VIP, or else (you may be severely punished): therefore the gospel had to be true! There is too much evidence in the gospel confirming the author was dishonest, for me to accept the truthfulness of the introduction and more so, the existence of Theophilus as the patron of "Luke".
Cordially, Bernard