Deadlift off boxes (rack pulls) vs. deadlift with chains!

[raw_lifter]

Hi, I was just testing my max and I find out that my lockout is very weak!
I am following russian routines, where is deadlift training mostly one time per week and I dont want to change this thing, because it is working great for me.
MO - SQ, BP
WE - DL
FR - SQ, BP

1) I was wondering, if its ok to add some extra deadlift (with chains or from boxes) to my deadlift routine on wednesday after regular deadlift routine.
Should I do it every training or once in two weeks etc..?
2) I have great dilema, I cant choose between chains or boxes.
Chains are good, because I do the whole movement and it gets heavier with the lockout, but you can never add the extra weight exactly in your weakest spot.
Deadlift off boxes (or rack pulls) are good, because you can set up exactly the barbell to your weakest point, but you dont do the whole movement, sou the starting position of the lift is not natural.

So, any advices?

If you want to see my video, where I am testing my max, there is code of the video - DWu4uFiVrb0 (just type this in youtube, I cant post URLs, because I am new here)

 

[joeblow12345]

I looked at your video. You have a strong pull. I dont think its your lockout that needs all the work. Your technique needs some work. You are rounding your lower back instead of arching it. Also your not using enough leg drive. This is causing you to lose speed near lockout, and why you struggle near the top. Try doing speed pulls and focus on technique and speed, you can also add bands or chains to overload the top. Drive your feet through the floor with hips down until you reach your knees. Then pull back and drive your hips foward. Go look up andy bolton on youtube hes a master at this.

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