SAM will probably be impossible to balance as long as it has the ability to one hit KO. It can stomp new players, but experienced players who know what to look for make the LB almost useless. It's definitely on the weaker end without it's gimmick (which is unreliable in and of itself due to things like server latency).

They probably just need to remove the 1HKO entirely and rework it's LB to do something else and balance the kit accordingly.