Yeah, gaunt broods provide cover for warriors, warriors provide cover for Tyrant units...not bad. Personally, I would make the death spitters
TL as it nearly doubles your accuracy

and can help prevent those embarassing scatters that land on your own advancing troops

. Don't know if I am in favor of the
BS over the
TL Death Spitter. Pros of the
BS, double your potentail hits, 12" more range, very minor chance of pinning. Negatives, you half your wounding power and your accuracy. Both are roughly the same point cost.