I can help you with some deep clades but not specifically with R1b or I!
I have done quite an extensive test on my DNA, I have test with BIG-500!
My subclade is determined as E-Y16729*:
https://www.yfull.com/tree/E-Y16729/
You can find my y-str markers, on the E-M35 project!
On the YFULL tree, I don't have a close match, or in other words, I don't share any other snp under Y16729, with the others who belong to the same subclade as me.
However, I do have a very close match on 67 y-str markers with a distance of 4!
I have done some investigations about this match of mine and I found out that he is from USA, however his more distant origin is from South Albania!
This guy declare himself as Greek!
Now the interesting part is, both me and him, have a very specific haplotype which is only shared by Aromanians from Dukasi, Albania and Stip, Macedonia!
The Aromanians from Stip,
I already posted about that in this thread:
https://www.eupedia.com/forum/threads/26718-Vlach-haplogroups-deep-ancestry/page19?p=544
Two other Italians from North Italy and one Szekely from Romania, also share our specific haplotype, although on minimal markers as the Aromanians do as well.
There is no doubt in me that I form my own branch under Y16729 with these Aromanians and my close y-str67 match!
Also, my paternal origins are from a village in a region, formerly known as Vlacho Meglen!
Vasil Kanchov, the Bulgarian ethnographer, had written for this village that it's a Vlach village which was in late stage of Bulgarization!
I have written about it in this thread of mine:
https://www.eupedia.com/forum/threads/35552-E-y16729
He also puts this village in the group of Meglen-Vlach villages.
However this a mistake, because by my own research, I have found out that the village itself was formed by refugees from South Albania!
There is a village with a similar name in South Albania, Konckë!
The village is located in the Gyrocastro region and interestingly, I have two close a-dna matches from Thesprotia in Greece, just over the border, not very far away from Konckë!
It is worth mentioning that the difference between me(13) on one side, and my y-str 67 match and the Aromanians (12) on the other side is the marker DYS439 on minimal haplotype!
You can find the Aromanian haplotypes in the Bosh's study of 2006:
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1469-1809.2005.00251.x
Also, it's worth mentioning that so far in the Balkans, Y16729 is found only in me, a Bulgarian from Strandza, South East Bulgaria and probably, the Aromanians in question with who I probably form our own branch under Y16729!
It's pitty that this very good thread has been hijacked by some Romanians!