im working on the power factor correction cap for my tesla coil. math says the ideal PFC cap is 82.9uF for my situation. i have two caps(both are AC Rated) that arnt that close. what i have is a 61uF and a 127uF.i guess what im wondering is, is it better to go under or over? or, could i take a couple DC caps and put them back to back(+/-)-(-/+)?