The original one wide edge on F1 is around 20 degrees close to the handle and about 13 close to the tip - and the edge have around 6 degrees convex sphere. Both sides of the edge is not exact the same - that is why i write "about".
After that have you sharpen your F1 - the question is if you have change the edge or not. Normally people sharpen convex edges by freehand. That normally make the edge slowly more and more convex. F1 is around 6 degree convex when yiu by it. That means that your F1 probebly now is 7-8 degree convex - and I think that your edge is sharp, but it do not penetrate materials well becouse the cutting edge have become to steep, I guess that your curting edge holds around 45 degrees total edge - or more.
Compare the F1 edge to other convex edges, for Example Bark River knifes that holds 2-3 degrees convex sphere - and you will se the differance.
The F1 edge is strong and very duable close to the handle where you use most force - and thinner and sharper (penetrate better) close to the tip where you use less force. It is a functional type of edge for all round knifes.
If I am correct about what I describe above, you must regrind the convex sphere totally, take it back to 6 degree convex sphere (or less) depending on to what you are using the knife to. I think your edge now is up to 8 degree convex sphere, or more.
This means that you first need to grind away material
behind the cutting edge - and later grind the edge smoth convex again out to the cutting edge. (My English is not the best as you can se and I am lack of words here - but I hope that others will explain it better then I can)
My F1 have today 4 degrees convex sphere and 34 degrees total cutting edge. It works fine for me
Thomas
