What are the requirements to become an ultrapeer?

I have a cable connection...
The disable box is unchecked...
The upload bandwith is max...
upload slots are 6 max... (maybe I should go higher?)
It's been running all night.

The last time I saw ultrapeer mode was when I was using v2.8.6 . It worked well then, but used all the available bandwidth.
I am now using v2.9.7 and it stays in leaf mode.