
I'll have to check this, as I remember that I made an even bigger version of my leviathan (RO's ultimate mech), bigger than 160x160. I'll post the ressults later (as I have to find, or remake the bigger version

).
Also the Core Defender is bigger, it's 145x189, maybe your problem could be fixed by the Core Defender's specific tag

, which is another thing that I'll have to check