go to elitefts.com and get the "40 yard dash" book under the "shop" section. Also, check out charliefrancis.net (or .com) -- he trained ben johnson and still trains world class sprinters. He posts on the forums over there and the forums cater to sprinters.
Plyos are good. Ever try bungee assisted sprinting?? Do it both pulling someone else and being pulled. I'm no doctor, but i know it forces your muscles to become faster. I did this when I used to play football, I was 6'4 285 and knocked my forty from 5.2 to 4.8 in high school, that was the main reason i ended up getting a full ride to school. I swear by this for speed.
Plyos are good. Ever try bungee assisted sprinting?? Do it both pulling someone else and being pulled. I'm no doctor, but i know it forces your muscles to become faster. I did this when I used to play football, I was 6'4 285 and knocked my forty from 5.2 to 4.8 in high school, that was the main reason i ended up getting a full ride to school. I swear by this for speed.