FURY
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You don't need to cast all lower level of Fury to get "higher" damage rate.

Situation 1.
Cast Tiger Fury, then Dragon Fury, then Soulfly

Situation 2
Directly Cast Soulfly

Damage rate will be same for both Situation. So just cast Soulfly

RAGE
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If you choose Chung Ryong subpath, you will still get opportunity to learn Warrior Rage (at Warrior Temple) and Chung Ryong Rage (at Chung Ryong Temple).

These two Rages can't be used at same time, so don't bother to learn Warrior Rage, just learn Chung Ryong Rage and save some coins!