CP Cap Purchase


I'm ready to purchase CP cap(s) for my coil and I just have a couple of 

My choice is between one .05uf 20kv cap or two .1uf 10kv caps (in series on each 
side of the primary). Since I have two transformers in series with the center tap 
grounded, it would seem ideal to use two caps for a balanced primary...

HVAC  O---|---| |----)            Supply Voltage: 10Kv -at- 300ma
      (   |          )
GND   O   *SG        } Primary
      (   |          )
HVAC  O---|---| |----)

Are there shortcommings to this approach? I'm assuming that the main advantage is 
that 60Hz is filtered from the primary coil...   ...Jeff