Ok, I briefly skimmed through your post. I will share my experience with our female greyhound. We had no idea she had space/food aggression issues. Now mind you it tooks us several times to finally get, and I mean get it! The last incident I was loving on her while she was laying down, well she bit me and I actually thought she ripped my face open and tore my ear off. Was it her fault NO! it was mine. I didn't respect her space and paid a heavy price to finally GET IT! Luckily I ended up ok, thank goodness I know the doctors at my work and convinced them to not report the bite. After that situation I implemented NILIF and it worked! All privelages were taken away, no furniture, bed privelages and she had to work for treats and feedings (i.e. would have her sit or lay down before getting food), also would have call her over to me/us for lovins. Stopped hanging on her neck when giving lovins. When she was on her dog bed we left her alone. Even is she would come up to us on her own for lovins we ignored her (not to be mean) but to establish that we were the leaders and not her. Thank goodness, it didn't take long for her to get it and things worked out just fine. We were blessed to have her with us for 8 years, we had to let her go last year at the age of 12.
Things can work out, you just have to take your time and establish leadership. You can not punish the dog for feeling threatened and feeling like they need to protect themselves. I know others will offer great advice as well.
Good Luck!