I don't know how to describe this fully, but I try to actually commit more racket head speed through the ball connection. On my forst serve I'm trying to hit it flat, or with what I call an agressive slice (i.e less spin and higher pace) On my second serve I am trying to get greater spin revolutions, therefore aim for a higher racket head speed.
I'm not aware of much of a grip change
Oh definitely -1st serve ball thrown out front, 2nd serve ball toss is more straight up and down
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