AT42QT1010:

• AT42QT1010 schematic (Adafruit) (Filimin using C1=10nF, 5nF worth trying, higher=more sensitive)
• data sheet
• Sensitivity Tuning
• Improving Noise Immunity

TTP223:

• data sheet
• schematic for generic module

These 2 ICs are not pin-compatible. For both a higher Cs reduces sensitivity.