Are there any gourmai that could go in the tank?
Honey Gouramis are supposed to be pretty peaceful (have not kept them myself) and don't get too large. I think they are supposed to be about 2" adult size. As mentioned previously though, there may be a possibility that the Tigers would nip at the Gourami's 'feelers'. You might do some poking around online and see if anyone has had experience keeping Gouramis and Tigers together successfully.
Your options aren't drastically changed having a 29 Gallon versus a 35 Gallon, however you do have less gallons to work with.
If you really want to keep the Tigers, they really could serve as your "Center Piece" fish, even though there's a group of them. They have great color and are fun to watch.