Unfortunately, I have a very clear idea about how to stop epoxy from chalking: remove it!

Epoxy paints chalk. All of them, even Kelley Technical's Zeron, which I have often recommended, chalk. Chalking is how epoxy pool paints wear down. Light chalking upon opening is normal with all epoxies. The difference is, crummy epoxies chalk a LOT more. Acrylic can be even worse, but it sounds like you are past that problem.

I suppose, if you drained the pool, and covered it with a water and light tight cover, that would stop the chalking. But, that's about it.

With Zeron, a party of middle school boys will work over the pool pretty thoroughly, and get the chalking done for the season. I've tried removing the chalking by wiping with wet towels, but found I couldn't generate enough pressure to do so effectively -- bare wet feet seem to work best. I've never had the chalking from Zeron do more than mark swimmers feet, but I've had other epoxies cloud the pool the first week of use. One horrible acrylic left the pool milky for half a summer.

I'm assuming that by mono-epoxy, you meant single component epoxy? My understanding has been that those were likely to be far less durable than high quality two component epoxies. I'd be interested in learning whether your experience continues to confirm this.

Sorry for your problems

Ben