How are temps now? Should be better!
So, after the delid using I dropped from 69°C to 67°C tested with 3 minutes of kombustor donut (260W from wall) which felt a bit disappointing so the next best thing was flattening the baseplate.
After that I shaved off another 3°C sitting at 64°C now. Less intensive loads show a larger delta because they're not pushing the paste thermal conductivity and cooler so hard
I tried MX-4 and NT-H1 thermalpastes and they both produced the same result
what did you use to polish? looks great
First I used Grade P600 paper to get it nice and flat, then P2000 and finally Metal polish paste to get the mirror finish