Industrial techno is still techno, feel free to correct me, but you'll have to forgive me for making the best of the minimalistic genre distinctions here. (pet peeve of mine)
I gave up on posting full tracks here, my experience is that they perform poorly given the kind of music i typically produce, your statement that you find this repetitive already highlights exactly this point and only reinforces my bias.
So no 8 minute version unless a LOT of people say pretty please with sugar on top :3
Lack of substance, well this is a fairly crowded piece with not a lot of headroom so i'm just going to disagree with you on adding synths, the ending i could draw out for a bit so i'll see what i can do.
Sorry you didn't enjoy it.