The guy in your video knows a lot and I’m sure his knives are sharper than mine but I think he is a little confusing
Take a look at the videos here they are very useful for freehand sharpening
http://www.knivesshipfree.com/pages/Sharpening-VideosLansky;
A couple of things
When you use the Lansky system on a knife for the first time you are regrinding
that knife to suit the Lansky so you might have to remove a lot of metal, when you re-sharpen it the second time it will be a lot easier

It might be useful to take notes or a picture of each knife so you set up the Lansky the same every time
I find that colouring in the blade with a sharpie really helps me to see where the stone is removing metal, I also have a desk light and magnifying glass
Also I don’t use anything finer than the red coarse stone for my kitchen knives, The edge seems to cut better for the kitchen
if i dont find an answer i think i need to sharpen my knife with 3 diffrent angels and i think its not normal..
If I understand your question correctly I have found that (because of blade geometry?

) the angle changes along the blade, so I have been changing slots depending on the area I am working on
See below
I hope some of this makes sense
