Using different mechanics for different pitches will tip off batters.
It will also be more difficult to develop good, repeatable mechanics if you're trying to perfect multiple sets of mechanics instead of just one set.
Finally, good mechanics and timing will put your release point where it will make your pitches the most effective - out front where movement is maximized and where it is as close to home plate as is appropriate. This applies to all pitches.
So, work on perfecting one set of mechanics for all pitches. You'll be better off in the long run, IMHO.