How many strings should you have in parallel?

["Mattias Engström" <mattias_engstrom-at-xxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Here is another one on MMC construction. I'm building a tankcap for a 10kV-at-45mA
NST and will then need a 14.32nF capacitor. I was then thinking about using 33
caps (0,47uF-at-1500VAC each) put in series for a 20kV 14.2nF tankcap. The
frequency of the primary circuit will be about 200kHz. 
Then the question is raised: Do I need to put several lower valued strings in
parallel to achive better current durability or could I just change the
frequency of the primary to a more suitable value. 
(or maybe I don't have to change anything at all :) )
 
Mattias