How come I have better luck solo queue in ranked than when I run a stack with friends?

Me and my friends run a stack of 3-4 in ranked and the lobby’s feel significantly harder than when I solo queue. We were getting steamrolled 3 out of 4 matches but when I solo queue I won 4 out of 5 times. Does us playing together effect the people we play against? We still have bad luck even when it’s just me and another friend and us just losing more and more is just getting demoralizing. Even in quick match lobby’s feel all around more difficult to compete in.