Random Question Grab Bag ! 8DX

[Pinky]

1) What's the substantive difference between these two Traits:

Tenacious
Normally, getting beaten up doesn’t do much for a fighter’s morale. Those with this trait are the exact opposite – when they see death encroaching on the horizon, they just try all the harder for it. Because if you’re gonna lose, you might as well go down in a blaze of glory. And hey, with the extra “boost” there’s always the chance that you’ll pull a surprise win.

Defiant
For some, the challenge of a strong opponent is what unlocks their hidden power. It doesn’t matter that their opponent is stronger, or faster, or smarter, or all of the above, they’re going to give it everything they’ve got and then some. Overwhelming odds is exactly where they shine. Fight the power!

For purposes of writing I can't really tell them apart.

2) Can't find an answer to this using the Search function. The definition of Ki Control is pretty vague.

Ki Control - 5 XP - The user is able to control the flow of energy inside and around their body, harnessing it into a physical form that not only can be used as a weapon, but also to power up their own bodies. This ability is required to use any externalization of energy.

Power-Up - This technique is granted in tiers, each one multiplying the combat ability of a warrior by a certain amount. These must be purchased in order (ie, you need Tier 1 before you can buy Tier 2).

Using Power-Up's definition as a reference, I assume "power up their own bodies" means that a character can burn ki to temporarily enhance CA. If so, how far does it go percentage-wise? How much does Focus come into play?