Hello all! First post here. I'm having trouble getting my MAC MT80 back to factory sharpness. I purchased it 2 years ago when I started to apprentice in the kitchen a bit while I was a waiter. I had it sharpened at Korin in New York where I also picked up a 1000/6000 combination stone and fixer. After 5 months my "apprenticeship" was over and the knife went back home for occasional home cooking. I now started full time in the kitchen again and had the knife sent to MAC in California for a nice resharpening and to fix a broken tip. It came back sharp but definitely not like the factory edge it had. It cannot hold sharpness down the whole length of the blade, and it loses the edge quite fast, even with frequent honing. I decided to purchase the Minosharp 15* guide rails that you stick on to the spine of the knife to hold a consistent angle when on the stone. They worked the first few times on the stone but I am back to the same issue...Can't hold the edge and can't get it razor sharp down the whole length. What am I doing wrong??