Hello,
I also use DDR4-3600 F4-3600C16D-32GTZN but on x570 MSI motherboard.
With BIOS AGESA 1.0.0.4, all works fine with only 2 sticks, A-XMP enable and 3600MHz speed manually selected.
With the latest BIOS AGESA 1.0.0.5, I can up the speed to 3733MHz (infinity fabrics at 1867MHz) with 2 sticks but the must is now I can use 4 sticks at 3600MHz. A-XMP enable and 3600MHz manually set.
DOCP profile when checked should report the timings expected, otherwise you need to wait an update or set manually the settings on your BIOS motherboard for DRAM.