Not sure if this helps, but maybe joining to add my recent experience with a lace unit.
It tangles more than my previous one and I notice the tiny bulbs at the tips of the hair which makes me think the hair is not properly ventilated.
Hair needs to be remy as in correct direction as it would grown from our head, not the opposite.
i do understand that many factories strip the hair completely and remove the surface of the hair so they can do the ventilation without needing to bother with direction.
Still, even if the hair was processed so it doesn't matter, I do see it causes much more tangling, especially when it comes in touch with my resting bio hair.
I am wondering if yours is also having the same issue, this issue usually happens with lace units.
Thin skin injected units never have this problem since they are injected in the correct direction and no need for ventilation so they can use hair that is less processed