For everyone here, it would be very helpful if we could get someone setup with @tmancey to screenshare as it’s the best way for the team to see exactly what’s going on and what the issue is (if any).
Also @klompje, the experiment you ran is not giving a clear picture of the system. If you read our Ads FAQ, you’ll note that, again, the setting you’re referring to is not "ads per hour":
I set Ads to display X ads per hour - why am I not receiving X ads per hour?
Please note that this setting is a ceiling rather than a floor.
That is; it does not dictate how many ads you will see per hour – it dictates the maximum number of ads you may see per hour. This number will always fall between
0andX, inclusive.
With this in mind, your experiment only exemplified this point by showing that ads do not appear at the same, predetermined rate.