JimbeauC: You simply need to score better in ranked rounds.
True, but I'm afraid to correct you to the other points.
For a TM (and lower), beating a higher tier does count towards the average. But there may be a limit in this effect, and perhaps PD has reached this limit with 28 wins against legends.
The last score of 31 (62 for the average) should also have had an effect on the saturated average, but one is not enough.
@pdking: Looking at your other visible scores which are substantially higher (I see three 34s, a few 35s but nothing below), I'm guessing that your skills are around a 68 average. Only your former Match wins have pushed your average down to 62 but fortunately not to 61.00 - you might become really unhappy as a Legend.
So, don't stare at your average, it will care for itself. You should rather look out for the fun in the game!
pdking: i'v been on 62 for 6 months,
You should also consider how much you have played in these months - I'm guessing, not too much. In the light of this, you're playing quite well!
Hit it straight!