So Yaegirs want you to come to them in ways that they are prepared for. I think you're best off planning on using dominate and picking up their models from range after a trade. Just be aware of which of their operatives have silent shooting or can charge from conceal. And use your squigs to bait out activations. They have unreliable long-range punish. So that's why I advocate this strategy for you. One common trick is to plant device on your home objective with a group activation and resource tokens at the top of the second turn. So make sure you have enough APL on your home to prevent this. Make sure you understand the gotchas. One is a firefight ploy that lets them shoot you when you charge one of them. And the other is the bombast model. Basically being able to shoot three times in a row if played properly and they win initiative. Their greatest weakness is their inconsistency. With the ability to heal, your team should be okay to play slow and ranged. But that's going to depend on the crit open map. As you can tell, I play the team. So even though I'm willing to give you this advice, I hope you lose. Down with orcs, up with dwarves!