Motherboard is able to self-learn...using 1.4V DRAM, 1.15V VCCIO / VCCSA 

• DDR4-3200 16-15-15-37-2T
• DDR4-3400 16-16-16-39-2T
• DDR4-3600 17-20-20-42-2T

Might try tightening the timings for 3400 or 3600...shooting for 3600+ / 4000 seems really aggressive...