Haplogroups don't have any connection with your autosomal results, the most North shifted Moldavians from Romania what I saw have J and E haplogroups.
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Central Croat
https://i.imgur.com/pZS3Ioe.png
North_Sea 19,45
Atlantic 12,04
Baltic 22,73
Eastern_Euro 16,69
West_Med 11,28
West_Asian 8,04
East_Med 6,56
Red_Sea 0,87
South_Asian 1,13
Southeast_Asian 0
Siberian 1,21
Amerindian 0
Oceanian 0
Northeast_African 0
Sub-Saharan 0
At this stage considering the results not much, but a paleo-Balkan latinised people that did not receive significant east Slavic admixture.
To answer Aspirin, I didn't check the MtDNA diversity. If the diversity is low and only one Y-Dna amounts to almost 50% you may be able to talk about an isolated population that is homogenous, so it might say a few things about the Vlachs, maybe. This is just a supposition.
I2a-Din was most dominant in vlach social caste in Dinaric alps, they were mostly of Slavic origin. Vlach caste was product of medieval Serbia https://en.wikipedia.org/wiki/Sebri
Catholic vlachs were Bunjevci.
Bosnian Croats in yellow based on last map . Not sure about one case where letters overlap.
https://i.postimg.cc/63VNmybp/ppppp.png
those 2 with kit numbers starting with T are probably Herzegovians too. Cumansky posted them in this thread
if you divide Bosnians From Herzegovians, Bosnians mostly overlap with Serbs, Herzegovinians are all north of Serbs
the overlaps are:
Croatian Croat, Bosnian Croat and Max Soldo
Croatian Croat and Bosnian Croat
Herzegovina Croat and Southern_Cro_2 who is from Dalmatia and Herzegovina