Are you talking about weight for the speed days?
The westside method has changed numerously over the years. Something Louie said in a video from 4 years ago is going to be severely outdated by what they actually do today.
With that said your speed days should be speed days. If you can do 10x2 or 8x3 or what ever you have your speed set/reps at with 75% and be very explosive and recovered 72 hours later for max effort then go for it.
It's best to err on being too light at first until you get a feel for it. 65% straight weight and 65% against double red minis is totally different.
I would check out the facebook group conjugate strong and read through it for more information.