Not sure where to get reliable virtual channel info other than the stations themselves. Certainly the FCC database will tell you which transmitters are broadcasting on what frequency.
http://transition.fcc.gov/fcc-bin/tvq?call=wnyw WNYW broadcasts from several transmitters apparently, but they are all virtual ch. 5. The primary analog channel would be 5.0, and the primary digital channel 5.1. The secondary channels are
multiplexed into the same broadcast frequency, ie compressed and interspersed in time with each other, and would receive numbers 5.2, 5.3, 5.4 etc. So it seems unlikely that you would have 9.2 coming in from the same station, since it would have to be on a different frequency.
Note that TV stations can broadcast to different markets on different frequencies, and these markets can overlap. Thus it is possible to get the same programming on two different channels. But this is just an artifact of the local geography.
I would watch for a while before I came to any conclusions re whether I had succeeded or not. Digital is typically an all-or-none proposition, so changes in atmospheric conditions or vegetation or local interference could be enough to push the signal to one side or the other.