I'm looking for thoughts on couplers for running on carpet.

Details: I've encircled my living room with EZ-Track. Because it's carpet, the track isn't exactly flat everywhere, and stuff like to come uncoupled (I have EZ-mate couplers, as they came with). By eyeballing it, it's clear that the problem is changes in height (so that they come apart vertically) rather than anything else.

I'm curious how people have handled this before. "Put it on an actually-flat surface" isn't an option. I thought about epoxying the couplers together, but that just seems like a bad idea.

Thoughts?