I have had similiar problems trying to research 'corps' soldiers as well, it's very difficult if not impossible sometimes. I might suggest the great war forum to you, if you've not tried it before, there are some excellent artillery experts on there
My grandfather was also a survivor, but as an infantryman I have been able to trace his 'war'
Ypres is my favourite place, it seems to hold a fascination for me
good luck in your search