Did you try running one of the example projects to see if you could
eliminate the PSOC.
I am sure you have seen these -
http://www.cypress.com/?rID=105694 CE95288 - CapSense Low Power with PSoC 4
http://www.cypress.com/?rID=78797 AN86233 - PSoC® 4 Low-Power Modes and Power Reduction Techniques
Discretes like bulk caps not leaky ? No floating pins configed as inputs ? No loads being driven ?
No pins taken outside rails causing input protection diode current ? No regulator drawing reverse
current in its output ?