R1b1b2 385a and 385b males at 11 and 17

I am curious. Perhaps someone can help me understand this better.

My haplogroup is R1b1b2*. What leaps out at me however is that my DYS385 is 11-17. According to http://www.smgf.org/ychromosome/marker_details.jspx?marker=DYS385 11-17 seems to be relatively rare. 11-17 occurs 0.169% of the time on DYS385. 11-14 seems to be the most common. 

Bennett Greenspan, President of Family Tree DNA, is quoted that "the 11,17 at 385a/b is not common for R1b males and is distinctive enough that it acts to tie them together." This seems to suggest that "most R1b1b2 385a and 385b males at 11 and 17 result in a Corca Luighe (Corca Laoidhe) Ossory (Osraighe) and Dál Riada (Dál Riata) Uladh Haplotype in Co. Donegal, Ulster, Ireland, 1600s."http://www.facebook.com/l.php?u=http%3A%2F%2Ffreepages.genealogy.ro... 

My questions include, how significant is this mutation in determining a R1b1b2 match? Could it, for instance, point to a locality, region, or even genetic line in Scotland or elsewhere such as Ireland as Bennett Greenspan suggests? Has any papers been published on this particular marker? Thanks for any comments or assistance.

Colin G Garvie