Any chance of enhancing Dragoon as a DD without the Wyvern? No matter how strong of a defensive boost you give to the Wyvern, the number one thing that kills Wyverns is the Dragoon dying. If the Dragoon dies, the Wyvern dies, and on bosses and NMs, that tends to happen due to extremely powerful AoEs being spammed with no way to avoid other than /NIN shadows(which is why people are primarily bringing RNG to most current battlefields and Delves. Halving Call Wyvern to 10min would be reasonable.
Additions to "Fly High" should be made such that Spirit Jump and Soul Jump retain their individual TP bonus and Critical Hit bonuses even if the Wyvern is not present. It would make Fly High more attractive as an SP abilitiy in that it would be fully effective whether the Wyvern is present or not. If our Wyvern isn't present but we need an SP ability, Spirit Surge is out of the question, but to have Fly High be ineffective due to not having a Wyvern is a bit much. At least make it so at least 1 of our SP abilites can be at full strength regardless of the Wyvern's presence.
A cherry on top for DRG adjustments would be for Spirit Surge to reset the Call Wyvern timer. It's often that Dragoons tend to not use Spirit Surge in a hard battle because it only lasts 60-80 seconds, afterwards the Dragoon's effectiveness is greatly reduced for the remainder of the battle(no other job or SP ability has this downside). Unless the Dragoon used Call Wyvern before entering the battle, and the battle progresses past 20 minutes, can the Dragoon use Call Wyvern again after Spirit Surge. Due to this, most Dragoons won't use Spirit Surge because after it wears off, we can't use Spirit Jump, Soul Jump or Restoring Breath any more.