Hi I want to overclock my ram I have T-force Delta 2400mhz cl16 2X8 RGB

Asus prime a520m-r

R5 5500

Psu 550w 80+bronze

I already increase the mhz to 2666mhz it was stable but the cl increased to cl 18 after that I tried 2800mhz it was stable too but the cl increased to cl20

* And I didn't change the voltage it's still on stock 1.2v-1.28v , I used mem64 to test ram stability