I struggled with my DW 22 for years, never could get acceptable groups. Then I tried a different barrel assembly and the gun turned into a one hole wonder with whatever ammo I tried. I have heard others complain about trouble getting accuracy out of the DW 22. You either get a great one, or a bad one.
I would suggest replacing the barrel. CZUSA still offers the barrels, and they are a bargin right now for $15 (6 " barrel only, which is all you need.)
https://shop.cz-usa.com/item_detail.aspx?ItemCode=20016Also check your barrel cylinder gap try to adjust it as tight as possible without causing the cylinder to bind.
Good Luck.