They are basically made for each other. The resting your goggles on the brim part will happen with any brim style helmet. I have the vantage helmet and you just need to find the sweet spot to put them. My smith goggles clip the same as the I/O in the back and I have never had an issue with them coming unclipped. In the link below though, there is a review of your goggle/helmet combo and what I saw that was different was how he has the helmet/goggle strap/lock thing in the back spread out around the clip. I would think this would cause the clip to possibly be pushed together and come undone? Maybe that's what happened with yours? Or maybe somehow this way alleviates your issue?
Smith I/O with Vantage