-Atk +Res Grima

As nice as ultra high attack is, he's got enough attack to kill most things anyway. I recommend giving him a special that can proc consistently in the first encounter to help burn down beefy attackers. If you think you'll be consistently doubled, stick with Ignis. There are actually a fair number of low speed armor units these days that you want to bait, so for those I'd recommend switching to bonfire. Also, if you happen to snag an extra L!Ephraim, his att/def stance is pretty useful.

id run distant def A and fortress res in S. ends with 48 50 24 35 35. gives you a very hefty tank on enemy phase with a physical and magical bulk each of 89 when being hit at range. throw in armor or dragon buffs and can easily get 51/51 on def being hit from range. id run him in an armor team just for armor march. -atk isnt a deal breaker on him just because its so high.