Yeah, I have found that I consistently get tougher games when grouped. I assume this is because we are going against other groups that are very coordinated. I have only grouped a handful of times and none of them are people I know well, so the communication and synergy isn't great. I assume a lot of groups play together often, have their roles, are coordinated and communicate well. On this Alt account I have grouped twice, once with Nirgon and once when I was asked to join a 3 stack making it 4. The results were the similar, 1-4 & 1-3.