I have run 3800c14 16 14 14 with both 2x8Gb and 4x8Gb with 3900x and Asus C8H using TridentZ 4266c19 1.47 Vdimm. I found what was important to get the 32Gb running the same timings as 16Gb was getting the appropriate CAD Bus Strength, RTT and ProcODT right. Also increasing vddg iod a bit.
I might try 4 of the new 3600c14 ripper edition sticks.
I might try 4 of the new 3600c14 ripper edition sticks.