CSX alone can't be used for water rejection. You have to use CSD also for this purpose since their response to the water is opposite. The other option is to use shield with CSD mode. Similar to CSD you should be able to access the rawcount for CSX also.
Looked through the CapSense generated software. One potential method for accessing the CSX raw count seems to be:-
CapSense_1_FLASH_WD_STRUCT const *ptrFlashWdgt;
ptrFlashWdgt = &CapSense_1_dsFlash.wdgtArray[i]; <-- Widget index here
CapSense_1_RAM_SNS_STRUCT *ptrSns = ptrFlashWdgt->ptr2SnsRam;
sensorRaw[i] = ptrSns->raw;
It actually doesn't seem to work (the code freezes), however that could potentially be another issue. . There doesn't seem to be a clean API for accessing the count/raw data.