I suspect your chain is worn or stretched so the rollers don't fit properly in the valley of the sprocket? That's the only thing I can think of that would cause a tooth to fail prematurely?
We are sponsored by Vortex and our cost is very low so I run Vortex on everything including our race bikes. I couldn't even guess how many we have been through over the past few years but quite a number and I have never seen a broken tooth except for the one I ran for 13K miles on a street bike.
If anyone would have problems with sprocket failure I'd think it would be the big HP drag bikes? And I've not heard any scuttle butt from those guys?
Do you have any photos of your sprocket with broken teeth?
Yeah, but as you can see the pictures aren't very good.