That is a shame AM....but not meant to be.
Yes I think that means high volume - I think your feet could still be thin/narrow and be high volume if they were deep (ha ha that sounds ridiculous!)
I have relatively narrow feet and I always thought bony. Recently my cousin tried on some shoes of mine that she was going to borrow because she had arrived to stay for a wedding without her shoes! We were both the same size but her feet just fell out of my mary jane heels. I decided that must be volume related.