How do?

As per the title, looking to discuss Lychguard and the best use of.

I have ten, armed with Warscythes, usually run as two units of 5, with Nightscythes to get them about, and of course to add a lot of dakka to my force. Yet I all too often find them lurking around either being used to bolster my main line, or being otherwise avoided like the plague by my opponent. Which suits me fine, as they still have an impact on the game.

But how to tether this with a bit more aggression? The Nightscythes tend to be used to drop them off where they're needed, then go to support the rest of my force. Can anyone suggest how to ensure I can get them into favourable combats??