walt
DuffProteinMan
I'm not really sure buddy.
But in my own experience negative training is very demanding and if I used it too much my intensity of work suffered as did my progression.
If and when I use negatives it's normally at the end of a set and used sparingly.
For someone who cannot perform a chinup on their own, negatives have been quite successful.
i don't mean the negatives you posted here where the postive is done assisted. I mean slowing down the negatives quite a bit, then exploding up the positives without assistance.