If I may add my two cents:
After checking on http://Oscar.dcarr.org it appears that the ISS has been active on voice between 21:00 and 22:00 utc lately. Commander Wheelock seems to get into patterns of availability on the radio but of course it depends on time available on the space station.
I used that as a guideline and found an excellent pass that fit in the timeframe such as that when I had made my contact back in June or July.
Of course there is a chance on any decent pass that you may catch him on the frequencies you mentioned.
I hope that his successors up there continue to be active after he returns to Earth at the end of the month I believe. Of course there is always packet and APRS but a voice contact is always amazing.
Http://www.issfanclub.com is also a site that has a wealth of information that may be helpful.
Good luck and enjoy!
Pat N2VYT FN20un