It's also worth mentioning that the mathematics he's doing are actually wrong.

If you have 48% PvP Power and hit for 14,800, then regem pvp power and reach a hit of 15,300, dividing 15,300 by 14,800 will give you 1.033, ergo .033 above your normal damage 1, 3.3%, right?

Wrong. Why? Because his base values are messed up in the first place. If you hit for 14,800, and go up 5% in damage, you're now hitting for 15,540 damage. Now, you may say, Tzero, come on, you're splitting hairs here! The difference between 15,300 and 15,540 is negligible!

Wrong again. Because divide 15,540 by 14,800 and guess what you get? 1.05, which is 5%! The same number that your character sheet will tell you when you check your damage increase.

No, you're wrong. PVP Power is a flat percent increase to dmg. Assuming:

10k strike. 0% PVP Power

@48% PVP Power, 10K becomes a 14.8K strike.

@53% PVP Power, 10K becomes a 15.3K strike

You assumed that going from 48 to 53% would add 5% damage to the 14.8K strike. That assumption was incorrect as you simply added 5% to your PVP power stat. Simply put, and this is what Reckful was trying to say in the vid, a 5% increase in PVP power is not the same as a 5% increase to raw damage. In fact it is raw increase of 1-((1+.x)/(1+.y)) where x equals starting PVP power and y equals endstate PVP Power. Interestingly enough, to get the 5% increase in raw dmg you referred to, just switch the formula around a bit to get: .05=1-((1+.48)/(1+.y)) and solve for y which gives you .557 or 55.7% PVP power.

Normally I don't post but you were pretty quick about calling out other peoples math. Peace out.

Edit: Pro(er) tip: Your character sheet doesn't lie to you but it still doesn't tell the whole story.