DraQ, I had an idea similar to yours, but instead of Dragon Shouts, I think those dragons should be equipped with all the schools of magic available.
Ability to become temporarily invisible, summon two dremora lords, use mass hysteria, mass paralysis, or mass berserk on enemies, resurrect dead allies to fight as its zombies, and use restoration magic to heal itself. Also the ability to become temporarily ethereal, if it is taking heavy damage.
Additionally, just to balance it out, keep the dragon's armor rating at zero. When the fight begins, the dragon must cast dragon skin. If you manage to stealth attack a dragon, that means you got to attack it when it was most vulnerable. And if you initiated the fight early, you did heavy damage before the dragon hardened its defenses.
Ideally, dragon fights should be mage vs. mage duels. That is the point of dragons being magical creatures. With fire breath and bite attacks, they are just trolls that can fly. But when they are two magically powerful beings unleashing their entire spellbooks at each other, that is something that should be cause for worry.