Physically, I have all the DQ lines connected to my IO pin, all the grounds connected to a ground, and 4.7k ohm resistor from a Vcc to the DQ lines. It would be best to connect all the remaining pins of the DS18S20s to either Vcc or GND, then a regular DS18S20 (not a -P) would still work in either normal or parasite mode depending how you connected it.
Strange, my code started working when I used another pin to supply current to Dq during the temperature conversion.
I am very glad that you have the device enumeration already working, that saves me a lot of time!
I will try it and report back.