Shadow of Mordor Crossfire Profile - Frame Pulsing Issue

I have 2 x ASUS Strix R9 Fury Direct CU III GPUs, and when using the Shadow of Mordor Crossfire profile from the 'Select AMD Profile' option in AMD Crimson, I get really bad frame pulsing. By this I mean it continually speeds up and slows down, then speeds up again - rinse and repeat, making it completely unplayable with Crossfire. Has anyone else had this? I thought this game was meant to scale well (Crossfire Game Compatibility List | AMD Crossfire Wikia | Fandom powered by Wikia ) ? Am I using the right profile, what options should I try?

 

Thanks!