Badou Jack is up there. I would be interested to know some of Toney's fight night weights from this time.
I believe @Serge had a compilation of fight night weights for Jack, Stevenson, Pascal etc in one of his threads. Some of the fight night weights were shocking.
Jack also said he had a walking around weight of 195lbs at one point. https://www.*******.com/badou-jack-ready-degale-admits-move-175-near--112498
They were all up at LHW though The heaviest I'm aware of is David Benavidez who another poster claimed weighed 195 for his last fight albeit technically he wasn't a SMW because he missed weight by over 2lbs. But if indeed it's true he weighed 195 and you subtract those 2lbs + from his fight night weight and he actually made 168 it would still be by far the heaviest weight for a SMW on fight night I've ever heard of. In fact, it would be right up there with the heaviest LHW fight night weights.
FTR, I haven't seen any proof he weighed that much but I have no reason to distrust the poster who said he did. IIRC it was @Chuck Norris
What about SMW’s in the 185-190 range? any hard information of fighters not dying to make that weight.