Looping a simple left-to-right animation with a changing speed?

[CrockAlley]

There's a gap of variable size when the end meets the beginning. I can't get the speed just right. See the transition halfway through this video:

https://www.youtube.com/shorts/JEx4mJbBMek

A simple setup. A 3D space, with a wall and a few characters in front. I'm moving the camera from left to right, slowing down at each character. Pre-comose the whole thing, then putting one copy next to the other.

I'm fairly amateur at AE and I'm grateful for any help. 

[Kevin-Monahan]

Hi,

Have you tried matching the velocity of the other keyframes? Sorry for the frustration.

Thanks,
Kevin

[CrockAlley]

Thanks for the suggestion. I've gone through and made all the keyframes have the same speed and influence, but the gap remeains. (It starts as a gap, then closes, then openes again as it crossed the screen.)