I would like to suggest you the sketching bundle “SK-V1-Bundle” by @RamonM, it currently seems to be the best thing out there for sketching. It is presented in the post linked below and can also be downloaded for free through it.
See if you can achieve strokes according to your imagination with it. It’s so much pencil, as only pencil can be. (my opinion)
Michelist
Add/Edit: I forgot to mention, if your strokes don’t look like pencil strokes with this then something doesn’t fit.