That's a pretty sizeable gain.
It's not 16-19-19, that 19 is tRCDWR which is mostly irrelevant (you can set like 8 if you want to, it's tRCDRD that's "tRCD"). You're running 16-19-27-58.
There's a few things but you kinda need to know what IC this is/might be before you start tinkering. Matters a lot for how low specific timings can go, how much VDIMM can be pushed safely, quirks, etc.
1.2V VSOC seems like a lot for 3800, especially since the CLDOs are relatively relaxed.
If it's Hynix CJR there should be a fair bit of room:
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