wow, looking great. You seem to have both a very good IMC and some very good b-die!
I would be absolutely ok with 3733 CL14 or 15, but I couldn't get it stable. Seems ok at first, then again doesn't train, etc. I'm fed up, sorry to say. btw, the Z390 boards from Asus also had daisy chained memory slots, if I'm not mistaken.
Is the bug where CPU Power Duty Control and Power Phase Control (and maybe increasing switching frequency) causes random reboots fixed? On Strix Z690-A D4 and TUF D4