When your serve breaks down in more ways than LeeD's body and deserts you to the extent you mentioned it's time to go back to basics! Start with the toss and stance...get to know what ready position works for you to enable placement of the ball in an imaginary box in the air at a height that allows full extension of your serving arm. If you can get it in that box 9 out of 10 times, your DF's will dwindle rapidly.
Google "Serve Doctor" for further advice!
"When a man is tired of London, he is tired of life"...Samuel Johnson 1777
"When a man is tired of Federer, he is tired of tennis"...stringertom 2014