IMO it has much less to do with the fed and much more to do with the lifter. People like Hoff are gonna get high squats passed more often. People like Mendy are gonna get generously fast press commands. Often times it's not even favoritism by judges or anything like that, it's just that the weights are so huge the judges get freaked the fuck out. I mean I would be shitting my pants if I were the head judge on something like that.
But hey, if you're a no-name raw lifter in the SPF, you can normally count on strict calls. Joe Ladnier in particular typically judges for them, and he is tough as shit.