I don't think it's intentionally punishing you, I just think the number of players with an MMR close to yours is kinda thin, so you're having to wait a while for four raiders with an MMR averaging close to yours to all cue up for a mission (that's how it works, yeah?). If you want to Antagonize more often, get your ass kicked a few times and drop that MMR. I'm at MMR 40 and ain't gotta wait any time at all (after 8PM Eastern). But I am starting to Antagonize less and less as I realize it's probably hurting the player base. But it's so much fun! Alas... THE GREATER GOOD!