Do you mean your fingertips are in the seams? Or that you keep them off of the seams? It is hard to say what you’re saying.
Personally, I like digging into the leather, rather than the seams, but I started by throwing them from the seams.
For a while, I experimented with a floppy wrist, with an extremely hard flick of the fingers, but it’s just not consistent enough for me, one wrong move and you get 10+ rotations, whereas with a stiff wrist you might screw up and still keep it to 2 rotations, which can still be okay if it is forward rotation. Keep in mind what your mistakes will look like throwing a knuck, a floppy wrist can lead to a flat meatball that’s gonna get hit 500ft. a stiff wrist will usually lead to more top spin which doesn’t take away from the big drop off the table at the end of the pitch (which is the most important part, forget about the dancing at first). Niekro even preferred to have about a half rotation or a full rotation forward at times.