what brand of arborio rice did you use, i find the supermarket stuff is not as long a grain as proper italian arborio rice, so needs less liquid and less cooking time, see if you can get really good arborio rice
ive made a LOT of rissotto, i find the best proportion is 380g rice, 100g wine, 900 water and 17mins cooking time - standing time 5mins = perfect risotto!
and I use the butterfly on reverse speed soft