i think looking at the pix and reading the details of most dogs in this thread, the actual percentage of deerhound in them is doing nothing more than adding a bit of grey wiry coat!!! and probably not really contributing in any way to their working characteristics. Mine are/have been all either pure bred or are 1/16 greyhound.....and therefore i think my points in my earlier post are valid , pertaining to the OP.
i actually saw the deerhound/greyhound grand dam of my pup lamp she was a fast bitch also a lovely dog. i wish i had some pics to put up of her . my pup resembles her quite some