Also fast explosive contractions use less muscle fibre recruitment than a slower more controlled contraction. This will increase fibre recruitment and place overload on that muscle causing the muscle to adjust and overcome next time round. What exactly do you mean by balancing power. If you are trying to say maximum power developed in the push, you are wrong. Max force is developed shortly after the chest where acceleration is at is greatest.
Max power is developed when velocity and force are very high with relatively short duration of lift.
However, if you are talking about getting an even distribution of work over the triceps and pecs you may in fact be correct. The question needed to be answered is what are we looking for. If you are just looking for adequate development of musculature, and doing multiple reps, then varied grip will attain that. The chest will develop the acceleration, as its contractile velocity is greater then the deltoid and triceps in the bench press. Actually, failure is occuring at the deltoids.