Are capacitor voltage ratings for max charge or exposed source?
Capacitors are rated for the voltage across their terminals.

Be aware that in many cases it is desirable for reliability to derate capacitors so that they never get close to their max rating.  Also the ratings may also be lower if the temperature is higher.

Why are you using a 200V supply if you are only going to charge the capacitor to 80V?  You will be waking more than 50% of the energy.