After watching your video you have a lot of body roll and the car is transitioning too fast. We have the rears on full stiff and and the fronts 1/2 from full stiff. You may need to go full stiff all the way around as your car is heavier than ours.

We also went with a much less aggressive brake pad in the front and the rear. We are running the stoptec BBK all the way around and it is so big that the pads we were using were causing some serious nose dive. Once we changed out the pads the braking was improved and I was able to brake later and deeper with more confidence. It also fixed alot of the handling issues we were having particularly turn in oversteer, this was due to the fact that the car was more neutral at turn in and allowed the car to be more settled throughout the entire corner with way less weight transfer from front to rear which allwed for a noticeable improvement in corner entry and mid corner speed.......corner exit, well that's a completly different issue