380 is very close to the max. Max does not mean sustained output - ratings decrease as temps increase. I like to double any power supply requirements I need - whether it is an electronic circuit I design or computer I build.
Edit - overkill yes - problems - NO.
Just think if you had to put out max effort - I think you would get very hot and then your output would go down. Can you monitor your psu temps?
BTW I am an electronic technologist - last 30 years.
You have to look at the derating curves for your psu to get a good grasp of how much wattage will be needed.