The thing with the googly is that you need it to be well disguised. For some people, myself included, you can only bowl the googly by having a high arm, a lower left shoulder and an earlier release point. That's ok against a lot of batters. Once you get to a decent standard, it is a big give away. At Test level, you simply wouldn't get away with it. You would need consistency in position at the crease and consistency in the release point. Adil Rashid and the ECB have been doing some videos recently (not very good videos, I should add), but you see Rashid talk about having the same release point in this little video: This works for Rashid because he has a relatively earlier release point for his legspinner. The likes of Warne released the ball at a 60 degree angle. Rashid is somwhere around the 75 degree angle, which is not far from the vertical. He's been working with Warne this week and I wonder if Warne is encouraging Rashid to release the ball a bit later? The front foot position is always an interesting one. Traditionally, the advice was to have the heel of the front foot on the same line as the toe of the back foot, but Warne's front foot was often a good bit wider than that. This gives you more rotation but also makes it slightly more difficult to bowl. I'm sure it impacts on the googly also.