FoWSC: T1 Questions

Hey everyone, I have a few questions about T1 for FoWSC. I have completed a few runs, but always needed a BU due to various reasons.
1. On the battlefield, how do you avoid interrupts from Skeletal Impalers? (#1 reason for needing a BU)
2.At the beginning of Battlefield, which groups do I pull? (Currently I am pulling 1 caster group, 2 groups with melee and the shadow ranger group)
3. How do I kill the mobs at ToS quickly enough to not need the BU?

That's all the questions for now, I'll try a few more runs to figure these things out myself. 1. Don't chain your spells. Cast them a couple seconds apart from each other. Also, standing so they're at the edge of your aggro helps too, so if you cast and they do shoot a D-Shot, it has to travel further and you may finish casting before it hits. Last thing, you can watch them while they're dropping traps and try to cast while they're doing that.

2. I pretty much aggro the same.

3. Don't aggro everything at once. Aggro ~3-4 Shadow Patrol mobs, block the Shadow Patrol on the wall, bust out a scythe, spam spam spam. You'll have more Sliver fuel to work with after they die, so you can start aggroing more and more. But remember, the more you aggro, the more Sliver is spread out.