I just received this JCK Original Kagayaki CarboNext Series 180mm Gyuto. It has a right-hand biased edge grind extra sharp. I very much like the 7" size in this type of knife. However, using this wonderful Gyuto I am looking to go larger. This is my 1st Gyuto and it was my German Zwilling 8" Chef's knife I was using as an example gets rather heavy for my tastes in larger sizes. The 2.2mm blade on the Gyuto compared to the maximum 8mm on the Zwilling 8" Pro S makes a huge difference in its handyness. I am wondering how I am going to maintain the 30/70 bevel for its righthand grind. This might be one I send in as needed. Looking at this photo it is amazing how my iPhone's camera picks up my fresh oiling of the blade with Tsubaki Oil.
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When you say 70/30 are you talking about the edge bevel or the primary bevel/grind? If the edge bevel, I generally just end up sharpening them at 50/50. I don't find that the edge bevel alone, especially at those ratios, makes much difference.