Good to hear from you! It certainly isn't an easy cemetery to find your way around.
I can happily report that I did eventually find the grave I was looking for, but not by the means I had expected - I happened to be sitting with an elderly family member whilst the rest of the clan ewent to a family funeral, and we got to talking about family. The old chap was struggling with early dementia and just happened to be having a particularly lucid time. After telling al bunch of family stories, I told him that I was having trouble finding the grave and he instantly gave me very precise instructions from the roadside.
Whilst I wasn't convinced that his recollection was accurate, I tried it out, and he was sopt on!
Sorry, I can't be more help with your struggle. Maybe it's worth another call to bereavement services?
Best regards.