trouble with raptor farm

The build posted is fine. However, I would personally swap out deaths charge with ural's hammer. more damage will make the run faster. sliver armor should gravitate to broodmother, so urals will finish 1 or 2 raptors and broodmother in 1 casting, usually. urals should be cast last, so gole -> ebon -> sliver -> urals. even shadow refuge is not needed, if you wait and cast SF before entering the cave, then aggro and cast sliver before the next sf cycle. as an a/e, if you need more damage, try taking the raptors outside of the cave in with you. however, it's possible to kill everything but the broodmother mob, and still kill broodmother with just her mob. these strategies, of course, are run in hard mode. so if you're trying it in normal mode, ironically, it becomes harder.
I mostly agree. I take [deaths charge] because of all the places I farm this cave seems to rubberband me more than anywhere. So I take it to get out of those situations, and there is a little spot in the back of the cave you can stack up the raptors and then shadow step to pin them in.

Now as far as [shadow refuge]. I agree you do not need it.....Provided sliver hits Broodmother on the first cast. If the first sliver cast misses, which does happen, you will die without a heal. I have actually had to wait until the third sliver cast before it hit her, I only stayed alive thanks to shadow refuge. However different strokes for different folks.

I totally agree adding urals results in the fastest killing.

Try all methods and find the one that works best for you.