Non-tapered sprocket teeth is simply bad design for that application, end of story. Keep in mind that this is high-vibration, high-speed, high acceleration/deceleration environment for chain and sprocket teeth need to contribute to the chain centering action. Otherwise there is a risk for them to catch side plate.
I did not invent how the sprocket teeth should be designed, this is basic engineering requirement as you can read from the IWIS material.
Here is good analysis of different alternative hubs:
https://f80.bimmerpost.com/forums/sh...7&postcount=38
In short, shop wisely.