Magilacuty: why is it that i can only lower my scoreby 1 tenth if i shoot 5 under or 6 under this is crazy
I disagree: It's math.
Your average is 64.68 and you have played at least 100 ranked rounds as a Legend.
"5 under" may be a 31 at STA, translating to 62 in the calculation.
Now, given that your average is not saturated from more than 500 rounds, it changes roughly by the difference divided by the no. of rounds. That is a maximum of 2.68 / 100 = 0.027 but possibly 2.68 / 300 = 0.009 or even less - the power of the high number RuL3z!
When did you turn Legend? Mind you, every single day from then you decided to play the game by your free will, looks like having enjoyed you enough?