OK, with 67 STR's I have some strong SNP predictions for them:
1) They have dys572=10, modal for BY611, modal for both BY250 and Y5587 is dys572=11. This is a slow STR. They should be BY611+ (also based on dys385=11-11)
2) DYS446=14, modal for all Z2705 including dys392=11 is DYS446=15+, so they are Z2705- (or at least some other SNP at that level that the current samples are all positive on)
3) They lack DYS565=11 (modal for R-Y30192) so they are Y30192-.
4) DYS446=14 indicates they are CTS9219+ because up until Y5592* DYS446=13 is modal.
Italian and Croat share with American YF06082 DYS549=9-10 so they might form a clade with him.
So treviso Italian, Hungarian and Juran should be BY611+, Y30192-, Z2705-.
The only other CTS9219* with modal dys572=10 is some R-BY46965 but they have standard dys385=11/10-14 Swiss and french they are 14/67 but also have modals and old values of dys389i=14, dys464a=16, dys464cd=18-18, it's very unlikely they are of this clade.
Juran is 5/33 with Italian, sharing some like DYS549=9-10, dys439=11 so it seems they are related. Hungarian also shares with them dys464d=18 though he seems distant, still he also has STR's suggesting BY611+, Y30192-, Z2705-.
It seems you are of Illyrian ancestry if this is confirmed (and I cannot see how these are not BY611+, Y30192-, Z2705-, and very likely Juran alongside).
DYS446 does have some rare 14 values among Z2705+ samples. Check out the Greek project, for example. But I agree that it is a hint that these might have split earlier. For the rest of what you said, I agree, although STRs are never certain indicators for SNP positions in these clades, especially with so few BY611+ Z2705- samples.
I would say that among the known clades, the likeliest possibility is that they split Z2705, or are at least BY611. But they could also be a completely new clade somewhere under M269, that we have not discovered yet.