Ok, Ryzen 1700X take-two. 2933 RAM vs 2133, 3.9ghz vs 3.8ghz, affinity set to the same quad-core unit, loading the game from M.2 vs external HDD, 1.7.3 vs 1.7.2. Everything I could think of optimizing.
Pretty much 10 FPS more. Honestly I think the RAM was the biggest difference. Affinity didn't...