Halo infinite SBMM in public match? And desych issue

I saw it seem there SBMM in public match when it should only be in ranked. I would usually do good it 22/5 then I start getting wrecked left and right for few match from very hardcore players can you please tone it down a bit or get rid of it. Another issue I have with the game is that thier no player collision I had an enemy run through and melee me in the back, and ehen I shoot an enemy sometimes the hit registration doesn’t work I remember getting killed by a BR in a battle when I was still alive enough to run in to cover. I also would melee an enemy player and nothing happens even tho I heard the noise and they turn around and kill me quick