Fast late:
At the end of the BS you have CHS=0, that's a result of deceleration phase, or slowing down phase. You start also from zero speed, so anyway you need speed-up phase in between. That means if you try "low and slow" you will cut the time/distance of the phase ramping-up the speed of the BS. Because of that the peak velocity is not big enough then you do not need much effort to stop the club by countermovement of the lowbody and you will not prepare good condition for effortless DS later. So you do not need the "low and slow" phase at the beginning of BS, trigger then increase CHS as soon as possible, IMO.