eppe said:
We can only really buff 1 unit per turn. Everything else will then crumble.
That's because you are using Life, and that's where you've gone wrong. I was there at the start of 8th edition, so I know why it appears attractive; but it isn't.
You want to be using Light, which has multiple bubble effects to improve more than one unit. Bubble WS10 Initiative 10 and bubble +1 attack, double movement and ASF. Bubble -1 to hit in close combat, -1 to shoot at, or must roll a 4+ to use a warmachine. Bubble auto-pass all Leadership tests. And unlike Life, you don't have to target one of your buffs on the caster's unit.
Speed of Light, Light of Battle and Pha's Protection alone protect you from so many things, from close combat monsters to templates, and even some of the worst spells out there (like Purple Sun).
I haven't looked back since switching to Light; and I run a Temple Guard horde, which you might think Life would be better for as its buffs are concentrated. It isn't. Life is great for keeping one unit alive; it doesn't do very well with multiple units, and more importantly it doesn't make it easier to kill things and win. Arguably, WS10 -1 to hit auto-pass break tests is just as handy as T6 4+ regen in any case. Against Life, your opponent knows to stop Flesh to Stone or Throne of Vines. With Light, they have twice as many considerations as each one can tip the balance.