Keeping the angle consistent is the problem with use a simple sharpening stone.

I recommend a jig that keeps the angle for you. I use a spyderco sharpmaker (https://www.amazon.com/Spyderco-Tri-Angle-Sharpmaker/dp/B004...), but there are others. I enjoy eating steak with a super sharp knife, so I have it out frequently for sharpening our set of steak-knives, and less frequently for our chef's knives.