Since none of the sprint guys are getting back to you, I’ll throw my 2 cents in and if I say something out of line maybe I’ll get corrected; either way you’ll get some help.
For the 60m, your early acceleration is going to be just as important, if not more important, than your max speed, even though you are probably hitting max speed earlier in the race than many on this board.
Having said that, I would suggest a lot of acceleration work. You might consider doing some of the accels on hills and sleds.
Also, since you’re over weight, I would continue with GPP style training until you are in better condition. Along with weights, do the med balls, hills, stadiums, sled pulls and extensive tempo. If your diet is right, you will lose the weight and harden up, and the better conditioning alone will improve your times.