Without being rude, my advice would be to get someone who is skilled at sharpening to show you how to do it properly, as sharpening anything is .just that a skill and needs practice
I have the same knife as you and it comes up like a razor. Perhaps nearly thirty years on the tools as a carpenter sharpening chisels, etc helps
It's all about grinding and honing angles and keeping them true.
Hope you get sorted
NH!