Z690 motherboards have all failed BIOS. I guess that all manufacturers focused on fixing problems with DDR5 and skipped DDR4 optimizations. Z590 overclock better but Gear1 runs lower. Anyway, check if Command Rate 2T works at 4000. If not then go for Gear1 at 3733 and tight timings or 4266+ Gear2. On Intel, Gear2 isn't so much slower while higher frequency covers that well.
I have no idea how Gigabyte DDR4 motherboards work but you should be able to run this RAM at 4600 CL16/17 or 4800 CL18. With adjusted sub-timings, it will still make ~50ns latency but ~65GB/s+ bandwidth (looking at AIDA64).