I am just beginnning to learn these serves. I use the continental grip, and I am beginning to generate spins on the balls. On the net, the advice is to use eastern backhand for twists and topspins. Trying it out, I find that it feels extremely unnatural to hit serves with Eastern BH. I'd have to position my wrist all weird to even hit the ball upward/forward. So the question is can I keep the continental grip and hit twists/topspins just as well as those who can use the Eastern BH?