I did put the IHS on.
I used CLU. I did a thin layer on both the Die and the IHS.
On my first delid, I think I used too much CLU. But when I last applied it, I spread what was already on my die, then would wipe off the excess, then would spread more, then wipe...rinse and repeat. So I do believe I used very thin layers.
Could I try only applying CLU to the Die, but not the IHS? or would that qualify as not enough?
You could try only applying it to the die and see if that works. But I'm not sure how thick the layer should be with CLU since I don't use it.
When you run IBT/p95 do the temps iincrease 'instantly' to near their max values, or is there another steady increase after the initial jump in temps? The former would indicate bad thermal contact somewhere between the die, IHS and cooler, while the latter would indicate that the water is heating up and you need more airflow/radspace.