one question though, the old thermal pad you removed was it 2.5mm in size? I hope it is.
I am not exactly sure which size the old one was. My new 3.0mm were to thick and then the GPU temp went up very fast to nearly 90°C, cause it had no full contact with the heat sink because of the too thick thermal pads.
So as now the GPU temp is fine, I think 2.5mm must be OK. If I would use 2.0mm they could be too thin and memory temp could go up again, if no full contact with heat sink. Don't you think?
What I try to say: I mean, that memory temp can not go down more with 2.0mm thermal pads than it does already with 2.5mm thermal pads.