Sorry SE, but endgame won't work if you don't fix something.

[Steeled]

I was doing some tests of Titan SM with fraps. Several times I caught people running out of of landslide on my screen and then getting hit. So the server told my client that the person was out of the AoE by over half a second and yet it still registered a hit on them.

First, this is a unique sort of proof that might show them there really is an issue. You should provide some timestamped screenshots, since SE might not watch a video.

Like
1:34: Archer Crossfire targeted for landslide
1:35: Archer Crossfire starts moving
1:36: Archer Crossfire passes out of aoe (it's important that this shows landslide not yet executing)
1:36: Titan executes Landslide
1:37: Archer Crossfire dead / damaged / knocked off (and thus dead)

However, that might not be the case. If you've ever dualboxed in any game and can simultaneously watch two screens, have one follow the other and you'll notice the leader usually takes a step further on the followers screen and then backsteps when he stops. This is the server, in most games, trying to predict movement a bit so that things look more seamless and things like follow function smoother.