just so you know, sundown is one of the few amps i trust to run at .5ohm. i ran a pair of 1500's strapped at .5ohm (.25ohm each) and they ran perfectly well for months until i reconed to run them .5ohm each. in my opinion, there is no risk as long as your electrical is decent.
its all up to you obviously. im just letting you know they will be perfectly fine at .5ohm. itll save you time and money to keep it.