I have unchecked the auto optimize ads which i thought would then evenly distributed the ad, but obviously not. Google really do not explain things clearly.
Please note that the percentages you see are reflective of the date range you're set to.
So, you will have to let the ads run for a full 24 hour day (defined as midnight to midnight PST) beyond the time you re-set, and then check for the date range of 'today'.
In other words, any date range that includes any time before you made the change will reflect the 'weighted' delivery, as well as the current 'even' delivery.
AWA