I would suggest you are seating the ball correctly. In this game, it seems, everyone has their own way of seating. I know the repeated bouncing of the rod off the ball is common. I think that is stupid and unnecessary. The name of this game for both safety and accuracy is consistency. Like you, I seat then put a small "umph" amount of pressure on the ball. Necessary? I dunno but that's the way I do it. BTW, too much "umph" will crush powder and cause pressure increases when you shoot. Not helpful. Carry on and enjoy.
Walter Cline's book is in agreement.