Role of the Right Shoulder

[Daryti]

I am a swinger, why if I use the right shoulder to go down on the start of the downswing, the shot is quite good, but usually not enough power for a full finish?

If I use the left leg, hip, left chest to pull it will have a lot of power, but usually a pull or hook due to I guess the shoulder goes out.

Then I try the left pulling, the right shoulder going down but its difficult, is this the right motion?