You can set LLC to what you are comfortable with.
You just dont want it to spike too high thats all.
You should be fine with LLC 5. I cannot say too much because I do not have your mobo.
Heres another example. It isnt exactly like this and I am exaggerating the values.
4.6ghz at 1.35v. It takes 1.35v to be stable. With LLC5. I can input 1.35v into BIOS, then when under stress the LLC will increase voltage to keep you stable but it may make you spike to 1.37v. (causing additional heat), but it always stays 1.35v minum so you will stay stable.
Now, if you set LLC4 and 1.35v in BIOS and you stress then you may get a slight droop and it drops to 1.34v and because you have gone under 1.35v you BSOD. So you up voltage in BIOS to 1.36v and under stress it drops to 1.35v but this is fine because you are still stable! so now even though you have increased voltage in BIOS and are technically at a higher voltage you are at a lower voltage at load and it will help with temps.
I am not the best at explaining things
You would be fine starting with LLC5 and as you learn work out what is best for you.
Some also use LLC 6 and some also do not even use LLC.