Veiger's E

So I just spent some time in practice tool and I have discovered something concerning. The point at which a champion actually gets stunned inside the Event Horizon is somewhat varied and random compared to the visual animation of the gate. They will always get stunned when passing through but at what point in the edge? If a hero walks into the gate from the outside (or dashes in case) they vary on whether they will be immediately stunned on the edge (optimum and expected scenario) or if they can actually make it a good step or two into the purple towards the center before getting stunned. They never make the center.( unless otherwise immune). Where they are stopped in the edge may not seem like much but is extremely important in high skill/risky plays. A melee champion can (at times) take one solid step into my event horizon without getting stunned and auto attack me to death (when I am securely within the circle but near the edge due to dodging skill shots) I have been losing certain team fights to this recently. Yasuo's ult animation goes down when we are both standing in the Event Horizon. Alistar can head butt and slam me when I'm in the edge of the Event Horizon trying to bait him but he doesn't get stopped Lastly Riven has been able to flip and stun her way to me when I am, again, just inside the edge of my own spell.

Could anyone please either make the animation clearer or the stun zone more consistent? Without this it makes baiting melee champions unreliable, as well simply reducing the skill ceiling for my favorite champion.

Thank you.