[HELP] DDR5 6000 CL28 – Are these timings good, and is a 0.5s microfreeze on Windows login normal?

Hey everyone,
I’ve been tuning my DDR5 6000 MT/s Hynix M-die kit on a Ryzen 7 9800X3D + MSI X870E Tomahawk, and I’d like to ask for feedback about my current timings and one small issue.

Current stable settings (3h OCCT memory test passed):

Primary:
• tCL: 28
• tRCDRD: 36
• tRCDWR: 36
• tRP: 36
• tRAS: 68
• tRC: 102
• CR: 1T

Refresh:
• tRFC1: 420
• tRFC2: 320
• tRFCsb: 220
• tREFI: 65535

ALL AUTO Secondary:
• tCWL: 26
• tRRD_S: 8
• tRRD_L: 15
• tFAW: 32
• tWR: 48
• tWR_S: 8
• tWR_L: 30
• tWTR_S: 8
• tXP: 23
• tWTP: 59

ALL AUTO Turnaround timings:
• tRDRD_sc: 1
• tWRRD_sc: 21
• tWRWR_sc: 1
• tRDRD_sg: 8
• tWRRD_sg: 21
• tWRWR_sg: 23
• tRDRD_dg: 8
• tWRRD_dg: 21
• tWRWR_dg: 15
• tRDRD_dr: 8
• tWRRD_dr: 21
• tWRWR_dr: 8
• tRDRD_dd: 8
• tWRRD_dd: 21
• tWRWR_dd: 15

My question:

Everything is stable under heavy load (OCCT for 3 hours, no errors, no stutters in apps or games), but I still get a tiny half-second microstutter right when Windows loads to the desktop.
After that, the system is perfectly smooth — zero stutters anywhere.

Is this normal for aggressive RAM timings on DDR5 + Ryzen 9000, or does it indicate a sub-timing that still needs adjustment?

Any suggestions on what I should tweak next (especially tWR, tRFC1/2, tRRD, turnaround timings, etc.) would be appreciated.

Thanks!