to tap or to strike?

should i at the end of 45m just tap the ground or do this from start to finish? I feel if i tap i lose power, i feel like im not generating anything. Then again its been awhile since i done it especially in a race. Coach says i have the lightest and quickest ground contact times considering my heavy weight, even moreseo then the 11.00 FAT sprinter on our club. I’ve been pondering whether to power maurice style or tap tap like asafa and gatlin somewhat do?

You want short ground contact time and Mo did tap, just as all top sprinters do.