Need some help getting a stable overclock

[leondood]

(New to overclocking btw. Did decent amount of reading before trying this)

 

Relevant Specs:

CPU: i9-9900k

Motherboard: Gigabyte Z370 Aorus Ultra Gaming Wifi (BIOS: F13)

RAM: Corsair Vengeance DDR4 3000mhz 16gb 2x8

 

So in a previous thread I though it was my CPU cooler causing some heat issues but turns out stock setting on this motherboard gave my cpu 1.5v when voltage setting left on auto.  Probably thinks the 5ghz turbo boost needs 1.5v since this is a z370 board with profiles for only last gen cpus. (Thats just a guess btw)

I set the voltage it manually and now thats all good. With stock clock speeds I set it to around 1.9 and it ran pretty good.

 

Now im trying to overclock this thing and the only way I can get a 5ghz is with 1.35v which comes along with 90c+ temps under load. No good

 

 

So I go for 4.9ghz and was able to get it somewhat stable at 1.275v. x5 Cinebench runs in a row and no problem but crashes on Prime95 (Smallest FFT's) .

 

Any suggestions to make this a stable 4.9ghz or even 5.0gzh overclock? 

I attached some images with details below. I'm trying all sorts of stuff but I don't know how many more blue screens windows can take lol.