I haven’t checked your study area yet but there’s one thing to keep in mind. Displacement slide happening on a north/south slope can not be detected but InSAR. I don’t know if it’s the case with your study area though.
I’d also recomment trying PSInSAR, as by the look of it you might not get a high coherence in this area, but there’s might be some rocks or boulders that could be used as PS but I am not sure, only way to know is by trying both.