It looks like the original question is lost in discussion. I have the same problem and had hope for an answer that fits. I moved to
a 12core and I see only about 5% increase. Premiere does not even use all the CPU power and is at 16-20%. The different between the 8 cores and 12core is just the cost and I am yet to see otherwise.
Is there a way to optimise the full potential of the Computers power
or is it a waste of money getting 32gb Ram and a 12core only to have the ram at 8gb and Processors at 20%?