The list looks reasonable enough, you could hone it more but it shouldn't be a walk over.
So, then, two things come to mind. Firstly, what are you playing against that's smashing you? There are some lists that can be more difficult match ups for
eFeora, but I'd like a few specifics.
Secondly, I'm wondering how you're using your infanry. If you've burnt up his infantry early on, your own infantry should be screening your own jacks from being charged by his beasts/jacks, and should be moving in layered formations so they can't all be charged/attacked at once. I also wonder how you're using your Errants in terms of Self Sacrifice? That's a brilliant defensive ability if used properly, you can take the charge from an enemy unit, then choose models to die who still have enemies waiting to attack them, preventing those attacks from happening. It can also be used to allow them to keep one guy alive in the charge path of an enemy jack, holding the line to prevent your jack from being charged. That said, because
eFeora doesn't actually buff them at all, you might consider getting some Zealots with a Monolith Bearer. They work well with casters like Feora, as their one turn of invincibility helps make them excellent jamming infantry even when unbuffed (while unbuffed Errants die quite easily). They're also two points cheaper, that could be used on useful things
As for your list... well, I'd recommend dropping Vilmon (he's better with Harbinger and Vindictus), getting Wracks and upgrading the Crusader to a Reckoner. The Reckoner has a much bigger threat range (12" melee threat, 22" assault gun threat), helping you to get the drop on enemies, rather than being on the receiving end. Wracks are just an excellent point spent, and let Feora camp more focus even while she's powering her jacks.
Anyway, hopefully some of that helped, but we'll still need to hear about how your getting crumped and by what to give you more specific advice