Thanks Hasse. Any difference in temp on average if glued compared to floating?

No diff in temp, if you clean the pcb you get approx 0.1-0.15mm play betwen ihs and pcb , when clamp down and all is clean on both side

you get higher pressure on the chip bending pcb a little, 

I dont reglue  , if you a for some reason take out the cpu i always check the paste even if a have liquid metal, no need for redelidd.