Proper Technique to lower a jerk (To rack position)

[BTBAM]

Is there a certain way I should be lowering the bar from overhead jerk position to a solid rack position? Reason I am asking this is I've been prescribed a healthy volume of rack jerks and I only have squat stands to work with, so I've just been guiding the weight down back onto my shoulders and letting my knees bend a bit to shock absorb. I fear that this has been giving my knees a good amount of grief though as they've been stiffer and much much achier than normal as of late and the knee pain came almost simultaneously with the rack jerks.

Also, aside from discussing the proper technique to lower a rack jerk, what could I be doing to ease the knee pain? I've already been doing a ton of ankle, hamstring, and hip flexor mobility/ flexibility work as well as insane amounts of foam rolling, lots of fish oil and glucosamine, ice/ heat etc. Yet still, my knees are continually achy. Any input is greatly appreciated!