I just purchased a new Kershaw Zing knife. I like the knife and think it will be a great EDC for light to medium daily task. I have a Spyderco Sharpmaker which I use to sharpen my knives. What would the factory angle be on the Zing ?. Would I use the 30 deg. ( 15 deg. each side ) or the 40 deg. ( 20 deg. ) each side ?. I would like to get it as close to the factory angle as possible. I have other knives for heavier jobs and use the Zing for general letter opening,box and package opening etc.. Thanks for any info. or opinions that you have. David