By default, $hfind looks for an item name that matches the wildcard text. You are looking for values that match the wildcard, so you need the .data property. Try this:
//echo -a $hfind(NickTracker,*!*@IRChat-313F98A5.brhm.adsl.virgin.net,0).data
It is simply your first //echo with .data at the end.
