so i have shun hiro sg2 8 inch chef's knife and i was trying to sharpening the things but i dont think my current whetstone will work for, its a king kds 1000/6000 combo stone, the rockwell rating for this knife is 64 and the rating for the stone only goes up to 62 for the knives it can sharpen. i tried sharpening my shun on it but i couldnt get a burr to develop on either side of the blade. what stones should i get to sharpen this thing? any thoughts would be greatly apreciated. thanks!