I've run countless A/B tests to improve earnings with adsense but one thing continually skews the results and costs me money, the single oversized text ad that takes up an entire skyscraper unit or link unit.
It happens in other units too but with the skyscraper it's especially bad since a single text ad placed in the unit results in HUGE text and a lot of whitespace at the bottom of the unit. Similarly, text link units only show one ad instead of the traditional 4-6 on occasion. No amount of A/B testing helps when this seems to happen at random.
Yes, the single ad likely pays more per click but it gets clicked much less often, much like happens with image ads on many sites.
Is there ANY tip, trick or setting to make these single ads in large units disappear? I want 3-4 text ads displayed in skyscraper units at all times. What Google is doing is essentially showing two different types of text ads in the same unit at random. You can't A/B test random.
