As a Dragoon as well, I certainly wouldn't see an issue with giving us a second or so of invulnerability while in the air during a jump. Would that really be so much to ask for? It sucks jumping, then suddenly getting caught by an attack during the recovery frames.

At least this way, you could use jump as a defensive tool as well. If you see the enemy about to use an AOE, you could use jump to avoid it, get damage, and take some pressure off the healer(s). All I can see here is a win-win situation for this fix.