I want my EDC knife to have a great edge at all times. I never know when that sharp blade will be needed. So..... I use a 99 cent box cutter, with easily replaceable razor blades, to cut cardboard and tape. The right tool for the job makes life easier.
Sharpen to a coarse finish, DMT coarse, Fine India, belt sander are all good options. I had trouble with edge retention on 154cm until I started using a very coarse edge.
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