Doesn't Djokovic use long strips on lead down the sides of his racket? If you add lead at 12 as described above, it would not be a Djokovic setup as rackets play quite a bit differently with lead at noon vs 3/9 o'c. I also think Djokovic uses more lead at 10:30 and 1:30 under the bumper but no tape right at noon.
To get a racket like a Djokovic racket, I suggest adding weight at 3/9/10:30/1:30 and counter balance with silicone or handle lead tape until you get to 4 HL (confirm his balance point). Keep adding until you reach your optimum swing weight which may not be 370+ like Djokovic as he is likely a bit stronger than you.