Tennis Grips Continental

How can I fix my tennis this service?
So I've been pretty poor service on the rest is OK. For some reason when I serve, Continental grip is the so uncomfortable when serving and I change it to an Eastern in the air. I know this is wrong, but I can not change it because when I think of the Continental to keep control, I do not have the kick, I'll try. is also a forehand topspin Continentals do not produce, that is the same for you? I serve overhanded.
the continental grip is actually best for topspin serves, and all other acts are generally there are several possible reasons why it feels uncomfortable. 1. You have to throw almost directly above the head, or even slightly behind your head if you want to kick serves. 2. You can throw the body too far or too far back, 3 must You adjust the mechanics of your swing: ……. For example, if I hit kick I used my arm extended upward to full extension while swinging against the posts and rotating my upper body. However, when I swing to the right of the post, I would frame was hit with the ball.
