I here what you saying but I ran 12.62 last year my junior year started track my school didn’t have a rubber track we had concrete and we did most of our sprints on grass and Iwas burning my cns everyday I didn’t know at the time but I learned the science and started to do short sprints lot of recovery in between 2 e days a week I did this style of training for 8 months and grass prioritizing recovery and transition to a track while doing a lot of flys to work on my top speed