I would suggest emphasizing Soaring Jump and Leaching Leap more.

Soaring Jump is a sack of trash that should never be created. It's a 4* ability that is only 25% stronger than it's 2* variant, with absolutely no bonuses. Leaching Leap does 92% of it's damage while being such a safe option and relieving your White Mage of a lot of stress. I can't tell you how many core-only runs or Tier Challenge runs Dragoon/Ricard/Kimahri have dominated by just spamming Leaching Leap. Well, you could actually check the post history, because they are almost always in the threads/comments I post.

Compared to Drain Strike, Leaching Leap does 35% more damage, heals 40% of damage done instead of 30%, and while you're healing your injured Dragoon it's very possible they jump and miss an AoE or strong attack, while a Spellblade gets rekt trying to heal and can't keep up. Also, since every Dragoon skill is ranged, your Dragoon should also be in the back-row. This means even less physical damage in addition to their much better self-heals.