What I can say is that you appear to fit in with the Matthias bunch in terms of haplotype. However, and this is a big however, and this also applies to the DePort bunch as well as anyone else who has had their dna tested, there are going to be NPE (non-paternal events) in most lineages. The Matthias bunch is proving this to be prevalent. The only way for us to know with 100% certainty of what the baseline haplotype is for any family, is to dig up the remains of the progenitor and extract his dna.
This is what people need to understand when they undertake dna testing. Normandy (which is where the Deport/ DeSaint John line is traceable to) is split 50/50 with R1b (which is your haplogroup) and I1a (which some consider to be Scandinavian, however, Scandinavia is pretty much equally distrubuted 50/50 with R1b as well.) We have no evidence that links Matthias to anyone in England or Normandy. On the flipside, the American who matches up with someone in England is I1, but that American's lineage stems from Ireland. It is well known that the aristocratic lineage of the Saint Johns went to Ireland for a brief spell, and the surname Saint John is also traceable back to 1200 in Ireland, which may preclude the Norman lines. We also know that some Irish lines are of Palatine (German) origins. Without Mr. DePorts actual remains, we cannot absolutely link the dna with anyone. In the absence of a papertrail it becomes even more difficult.
It is also well known that within this aristocratic lines (particularly the Saint Johns as it was explained to me by a historian at Purley Magna) there were plenty of children who were born out of wedlock. So it may be possible that Matthias or one of his descendants were a byproduct of a NPE and therefore the dna would not match.
Like I stated above, your haplotype appears to fit within the group of Matthias descendants, but within this group we have a lot of members who do not match but share similar clusters (little groups of specific loci designations). We can therefore deduce that there have been many NPE within the Matthias lineage or the scientific algorithms that calculate TMRCA (time to most recent common ancestor) needs to be adjusted. FTDNA does not agree with the latter part of my statement, but I am still leaving this open as a possibility. The other certainty is, that we the members of the Matthias clan, are in no way matches to those who are in the DePort category, but this does not connote actual ancestral derivatives.