I did it I finally submitted someone!!! I just submitted Cain with carwin and bisping with Franklin.
1st don't have the game on beginner put it on experienced at least. For some reason it's easier to sub someone that way. Ofcourse beat the body wear them down completely. Then slam them from the clinch so they are rocked then attempt to submit them. When spinning the stick do it smooth with the stick touching the rim at all times and do it at a moderate speed not really fast.
If you have a ps3 my name is chw22 pm me your screen name I'll add you as a friend invite you to my camp and maybe it will help if i talk over the mic.