1)They all fight but hissers fight the worst and often kill each other.

2)Turkistan in my experience (never had lobsters)

3) Dog food is a poor diet for roaches. Keep in mind these roaches will be going to your animal as feeders.

4)temps seem fine.

5) blatta lateralis are the most nutritious out of the ones you have listed but they are not so big.

do you plan on mixing species?