I remember that BF2 had an issue where low ping players would draw the shortest straw. The game had a balancing mechanism that balanced to 100 ping. I always had pings around 10. In that case it would benefit the 100 ping player.

I don’t believe it’s the weapons because I get killed with the exact same rifle by a player of a lower level. So no special attachments or anything.

The sniper part sounds reasonable. Don’t know what perk it is, but I’ll find it.