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The plate might change it a bit but full foam config usually lead to the marbly sound which I think is the creamy you want. If you were not using all foams and wanted the clackiest sound I would say to go with alu plate, if you want a softer typing maybe try pom o pc plate, fr4 would be something in between alu and the others
I would say that you will be able to get the creamy if you use all foams >

So the plate would not matter that much? Because I’ve planned to put on some foams inside and lube already!