I tried the first 2 days stacked and never had him. After 65 games my friends began falling of so I just solod. Saw him the first game solo... 
I finally got him on game 140, was teased twice and joined one where I got to see the other team get it as soon as I joined before I finally got him. 
No exaggerations. My only point is to offer those still hunting some stats. It's rough out there, keep up the good fight. 
When I won I messaged the person on my team that kept sniping all the invaders and told him my children will sing of his praises.
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	Similar situation. Made a fireteam other day to grind. First match servitor spawned and we got wrecked by other team. Then we went on a win streak for about 2 hours straight and no servitor. Luckily yesterday finally found it again with matchmaking and we won. Now for the stupid team wipe haha I suck at invading
 
										 
					 
		    