Argon2M CPU mining terrible results on AMD Threadripper 1950x

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Anyone else mining MERGE (Argon2M algo) ?  I am mining it on a 3 laptops, 3 rigs ( using the RIG's CPU ), and my desktop.
Here are my results


Intel Pentium G4620 @ 3.7Ghz 8GB
76 kh/s

Intel Pentium G4400 @ 3.2Ghz8GB
47.4 kh/s

Intel Core i7 920 @ 2.67 Ghz 12GB
120.8 kh/s

AMD Threadripper 1950x @ 3.4 Ghz 32GB
100.2 kh/s

Intel Core i7 7560U @ 2.4 Ghz 16GB
141.3 kh/s

Intel Core i5 3337U @ 1.8 Ghz 8GB
87.6 kh/s

AMD A6 4400M APU @2.7 Ghz 8GB
65.3 kh/s

Intel Core i5 2410M @ 2.3 Ghz 8GB
36.7 kh/s


It seems to me the mining software is more optimized for Intel CPUs
Any advice on getting better hash rates on the Threadripper 1950x?
I have tried adjusting the number of threads and it made no difference.
Its only using 10% of my CPU.  Only way to get more hash is to run multiple instances of the Miner.