Hey. I remember when it was popular and beneficial to replace the factory thermal paste on graphic cards. I use to always do that. In fact before I even installed one I'd replace the heatsink and apply artic silver. Every single time. This was years ago. Then after market companies started to install better cooling and I stopped applying new paste. I currently have a Asus Strix 2080ti. In runs fairly cool maybe around 50 to 55c while gaming. Around 30c something at idle. Would I even benefit from maybe applying some grizzly paste? Just wondering.
I wouldn't use liquid metal on an aluminum heat sink though not sure why anyone would even mention it for a air cooled gpu
Nickle is okay and maybe copper but it will mess with the copper too but these are pretty rare on an air cooled gpu water block yeah.
Depends on the temps you are getting now and compared to others. Temps seem good IMHO. I did the Hybrid route with a h100 v2 and kraken kit with some small mods on the CLC pump housing. Temps never go over 60c in any scenario.