The purpose of this thread is to share a few discoveries/thoughts regarding Earth and Hyuuga scaling after a bit of testing on the training dummies in the academy.
Earth
First of all, the only Jutsu of Earth that seems to be intended to have attack-power scaling is Boulderfist since it's stated in the tooltip.
However, there are two more abilities that come with ap scaling: "Earth Spike Explosion" and "Bedrock Grasp Jutsu".
Test Results
Here's the damage of Bedrock Grasp and Spike Explosion without 7x rank III ap cards equipped and Byakugan active.
And here's the damage with 7x rank III ap cards equipped, Byakugan and Twin Lion Fists active in order to highlight the difference.
Hyuuga
Starting off with Balance Breaker, it doesn't scale with either ap or sp. Furthermore, it has a chakra-drain effect which isn't stated in the tooltip.
That being said, the rest of the Hyuuga abilities seem to scale off of ap.
Weapon damage scaling
In addition to having ap scaling, both 64 Palms and Air Palm also have weapon dmg scaling implemented.
The test here consists of three different weapons in the main-hand:
1. T2 Kunai of the Tiger
2. T1 Katana of the Rat
3. Kunai Blade (which needs it's dmg to get lowered since it's a cosmetic)
1. Test (Kunai in main-hand)
2. Test (Katana in main-hand)
3. Test (Kunai Blade in main-hand)
Here's another example of 64 Palms with a Kunai in the main-hand and having Twin Lion Fists, our Daga Jutsu with a 10m cooldown, active:
To sum things up, I think that these two important abilities of Hyuuga shouldn't scale off of weapon dmg. The abilities force you to have at least one Kunai equipped and since these don't vary when it comes to their base dmg, they should have better ap scaling like Palm Rotation does have. That would also make Twin Lion Fists more meaningful within it's own mastery. Speaking off it, the part with the exhaustion doesn't work. You can benefit from Lion Fists right after the 5 minutes of cooldown (which is needed cause even with Lion Fists on, other melee masteries have way more impressive damage output at the moment). I can see the synergy with other melee masteries justifying that 10m cd tho.