If it were me, I'd use the extra points (and maybe trim a tiny bit more) to get the Devastators into Rhinos, and slam on two Grav Cannons each (since the Rhinos have two fire points). The main reason for this is so you have an out against things like the Riptide, or other high save, multiple wound targets with T5 or greater. You get the full five shots per Grav Cannon while on board the Rhino, and it gives you a little more combat flexibility.
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