I tried all your suggestions last night, and I had success! I offered medallions to 6 of the cats (Sprout eats seperately), and 5 of them got eaten!!! To be honest I'm not totally sure who didn't like it - they were all moving from plate to plate. I know Adam, Delilah, and Bastian were scarfing the raw down. I saw the other three nibbling, just not sure exactly how much each of them ate. (They got canned in the same meal, so I know they ate that!
I'm planning on trying Sprout on the NV Instinct Lamb this weekend, and if he does okay with that I will try to switch all the cats over. I also got some of the lamb formula medallions yesterday to see if they'll eat those. I think ideally, at this point I'd like to switch to about 50/50 canned/raw. The only part I'm still trying to figure out is what is best to offer them for between-meal snacks!