I don't know if it will make a difference in any help, but here is the code relevent to scanning the TS:
Code:
XRaw VAR WORD
YRaw VAR WORD

Xp VAR PORTA.3
Xm VAR PORTA.5
Yp VAR PORTA.2
Ym VAR PORTA.4

ADCON1 = $0D 'Set only PORTA.0-1 Analog


'Scan X
    HIGH Xp
    LOW Xm
    INPUT Yp
    INPUT Ym
    PAUSEUS 5
    ADCIN 0, XRaw
    LOW Xp
'Scan Y
    HIGH Yp
    LOW Ym
    INPUT Xp
    INPUT Xm
    PAUSEUS 5
    ADCIN 1, YRaw
    LOW Yp
and a schematic of the hookup: