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Yeah, the enemy specific orders seem lind of hit and muss sometimes. Took a bunch of dives to find the tanks one time which was frustrating and I didn't see spewers yesterday.
It seems like spewers are clustered on specific worlds, where you either see zero or dozens.
Interesting. Ran nuke nests mission today and we saw about 6 in 1 mission on level 8
Spawns are table based and random between missions. Means that each mission has a set table of spawn types. For example, two of the most recognized tables for bugs are "this mission has tons of bile spewers" and "this mission has chargers and bile titans"
You are gonna get a higher chance of more elites spawning at higher difficulties. So 6 and up.
If all you are interested in doing is farming the kills, then find a mission where bile titans spawn, then carelessly aggro all patrols and allow as many bug breaches to spawn as possible in order to allow more opportunities for elites to spawn, then get your kills and leave mission, since you don't have to even complete the mission to get credit for the personal order
For that one, I just did a killbox on 6, had the PO done in like 5 minutes... I think the spewers are pretty much guaranteed on those missions but I can't be sure since I 1) typically avoid killbox missions, and 2) prefer fighting bots over bugs