Still sounds a bit like a terrain or deployment issue. It should be possible to deploy so that those Yuan Yuan can't cover more than a couple of enemy figurines per Chain Rifle shot at best, so if the deployment zone is missing walls to duck behind, vertical deployment opportunities, etc, then something else is wrong.
That, or there's always the issue of the Yuan Yuans finding blind spots to drop inside so close to your table edge that they indeed can move up to you with one irregular order.
At which point it's probably a case of the midfield being too densely packed with terrain? This could very easily devolve into a ''proper table setup'' discussion, which is an entirely new and yet also deeper rabbit hole-
It doesn't have to be. If the meta in question is sufficiently new that they don't have 3+ people who've spent 500 hours making their ideal ghetto/suburbia/tropical rainforest come true, then it might be something as simple as they're simply using the papercraft stuff from a bunch of Operation: Verb Noun and/or GW terrain (a.k.a. lots of horizontal cover but no verticality*) * Not dissing GW terrain too much, it does tend to contain designated areas for area terrain which Infinity players seem to abhor. Just... can't all be Cities of Death.
If you think trading one of your model for a yuan-yuan and his irregular order is a bad trade, then you should either try not to die, or make your opponent spend more orders to kill you, ideally both. So here's a friendly reminder that if you don't want to die to DTW then dodging is always an option, as it doubles your odds to survive another order. You should only shoot if the yuan-yuan is in a very bad spot and you really can't let him throw smoke arounds or play with his chain rifle.
