***disclaimer - I have not read the entire thread. So, sorry if I mention something that has been covered ad nauseam.***
I had the classic 'fry pan' serve for a very, very long time. A lot of work, pain, sweat, and tears went into changing that. Now I have a serve that is very consistent, but not a weapon. I use a continental grip unless I'm looking to kick it to the ad court, then I move it over a bit. My kick is not a weapon at all, again, just consistent. If my opponent is a women with a 'chopper' one hand BH, I will use my 'kick' as a first serve to her on the ad court (out high and wide to her BH). I don't have a slice, or at least, not something I would classify as a slice.
The things that I think are right about my serve - I'm finally keeping my arm loose, and just working on 'throwing' the racquet (just this morning my pro had my throwing tennis balls to get that feeling). I think I'm doing a good job of moving into the court as I serve as well. I often land on my left foot into the court (but not always!).
My focus for my serve will continue to be consistency and placement, and then work on adding power. I did have one ace in my last match, and I was going for it...but just thinking more about swinging fast and hitting out.
Have we discussed toss??? The toss is incredibly important...I actually practice inside sometimes just tossing the tennis ball.
I'm 5'4", so I feel the pain of the 'shorties' in this thread. For fitness and strength, I've been doing crossfit since the summer, and I also run. Cross fit has helped my explosiveness *tremendously*! My trainer knows I play tennis and tailors my workouts appropriately.