Both my 6.2 and 5.7 have the same temps....hovered around 220 once fully warmed up and driven normally for a while.Just checked, they take the same squirters (392/6.4L and 6.2L) so would just be more volume through the same orifices.
Specifically regarding the Demon:
What are your oil temps like? Do they stay close to coolant temp or do they get a fair bit higher?
The 6.2 saw 250 at times when driven hard. Don't really drive my 5.7 hard like the 6.2.