Keep the demise, keep the stat 5, give them reva's ability to reduce burning to add positives to duels. Keep at 8 stones, increase def to 5, and build in a tomb to breath of fire. I think that puts the model right in line with other 8 stone models without over tuning it. Or just make breath of fire stat 6, that would probably work too.
If anything its probably still slightly under tuned, but at least I would take it once in awhile.