Well as suggested, Ultrapeer mode cannot be forced (unlike it could be in earlier LW versions). And being an ultrapeer is not promised by LW. In time I'm sure your LW will become one. Perhaps presently there are sufficient ultrapeers on the network in your general area. Patience is a virtue. I believe the longer you are connected, the better chance of going into UP mode.

To check if you are running in ultrapeer mode, go to Connections window, if more than 5 U.P.'s then you are running in ultrapeer mode.

I do not run as an ultrapeer, yet you saw my speed examples in my link above. I was simply downloading from 10 or less hosts per file. Yet my bandwidth is probably not as high as yours. Speeds very much depend on what bandwidth is available by the hosts you are downloading from.