This is for ten man, I dont know if it works for twenty five...Anyway, here it goes.
You start with the normal vehicle setup, but instead of having two choppers you have one chopper with two people in it.
This is based on the fact that choppers are pretty much useless except for being a taxi...So instead of having two useless taxies, we have one and one person doing leet dps.
When you engage him, ONE of your demolishers launches your best ranged DPS on top of him and they proceed to kill the turrets. While that is happening, the person who was in the sidecar of the chopper jumps into the gunning place of the demolisher who launched the person.
The only goal of the passengers of the demolishers is to shoot down pyrite and get it for their driver. The driver should start the fight with ten stacks of pyrite right away. While the person is destroying the turrets, the gunner should have gotten the driver to full pyrite. When he shuts down, both demolishers should spam pyrite again. The person who was destroying the turrets will get picked up by the only chopper, the person who took their place will get launched up, rinse and repeat until dead.
Enjoy.