The driver mod is always at the top of the list. A good track helps. I run consistant 12.30s at sea level. I also run at a local track with a 500 ft elevation and it runs 12.50s there but I have never been able to get my 60 foot times down at the higher track either. BEst 60 ever there was a 1.79. I run consistant 1.69-1.72 at the lower elevation track.
good to see variation/track/da.. I feel better about running in 12.3-12.5 midday State Capital in Baton Rouge in June.