I am not a cam expert. Just installed them the way somebody who is, said to.
From what i understand, retarding the cam tends to perhaps help on the big end, but negatively affects the starting line.
I do know going to a wider LSA had a similar effect( killed bottom, was supposed to help the top) that I actually tried real world. Et slips hated the wider lsa( a lot)
Is that not true ?
Frankly, I have never heard of anybody I know who races not advancing a cam to where the manufactures suggests it to be
In other words, I have never heard of anybody with a 108 cam installing it at 108.