AI uses two units in every attack wave, and can it use zeppelins

[tomoraider]

I made an AI for a blood elf race, and I changed the Phoenix unit to be like a normal unit, it doesn't just last until it dies and it doesn't turn to an egg. I just added the two Phoenixes to one attack wave, but the AI uses them in every attack wave. Is there any way to fix that?
And second, is it possible to have AI use zeppelins? Because I made one enemy base apart from the land, and it just seems stupid to have them use the teleporter to attack.
Thanks for you help.