Sadly, I find I do much much better with randoms.
I'm just not good enough for a GAF group. Matchmaking always seems to pair up our full group with another well organized group - and I just can't compete.
When I go solo the randoms are as disorganized as my team, and I find I am good enough to usually be at the top of the board in that scenario. It's weird, but it's a thing.
So if anyone wants me on their group I will usually go, but just know what you're getting.
I guess somebody has to be at the bottom of the board