Try this, you only get one point for a body shot wheather it's 80% or 100% of power. The time that it takes to deliver the other 20% is what top competitors reclaim to fire the next shot or evade the next attack. Since most top players can't deliver one shot - one knock-out, most play the percentages shots to the body and evade.
To continue my curiosity....I can see the point of an 80% shot versus a %100 shot if the 100% shot is slower by enough to matter, but...is that the case, or should it be?
In a simplistic case, F=MA. Force equals mass times acceleration. It seems to me that generting power in a strike is done through both factors. There are foot pivot movements you can use to get more mass into an attack. For example, a sidekick done with pivot on the plant foot will move the body forward a few inches and if timed properly will give the attack the mass of the whole body rather than just the strength of the extending leg. The other side of the equation is Accleration, which in this case means how fast are you hitting the target, or rather, how fast the weapon is hitting the target at point of impact.
Without going into the biomechanics of fast striking, it seems to me that the 80% versus 100% difference in attack power comes down to two things. One is speed of attack, the other is depth of attack. It seems to me that from just a strike power point of view, your most powerful attack is going to be your fastest attack. Or conversely, the faster the weapon is moving at point of impact the more power the strike will have. The other side is the depth or penetration level of the attack. If you aim for the surface, you will hit the surface; if you aim for six inches of depth, you will hit the surface...much harder.
It seems to me that if you want to hit hard, you hit fast. Hitting at 80% power is no quicker than at 100% power in terms of just how fast the weapon is moving at impact.
So...does hitting for six inches of penetration cause you to be slower then hitting at 1 or 2 inches or at surface level?
Or, is there are tradeoff. If hitting shallow is faster than hitting deep, how much faster? Hitting deep will probably occupy your opponent...enough to offset the difference in time?
I guess I'm curious..or maybe hoping..that if you train to kick with 100% power and you spar like that, it can be effective in plympic style sparring. Kicking 1-2 inches may be common, but is it really neccessary?