There is only one problem with building concs on a toon like this.. you dont get hit enough fir it to really matter, ofc it will proc every now and then but I doubt it will proc as often as on a low AC guy... I noticed this on my build that was similar to this(15/1) I felt "ohh.. wow.. I really blew those scales on ****, didnt I?" Concs are abit meh! anyway since they aren´t that reliable in a raid fight. But if you got the spare scales.. then why not?
Good AC and almost insta-self heal will make this toon very cleric friendly.. can Imagine that a group with 9 rangers, 1 tanky kind of build + 1 chanter(self heal, dps-build) and one cleric would work extremly efficient.