Just launched our new mobile site (dynamic serving).

Google rep told me 300x250 on mobile - within articles - does wonders for CTR. And yes it's already been clicked around 450 times and I expect 700 clicks just on that single ad spot before the night ends.

I'm not sure if I screwed up or if it even matters. I used an old 300x250 code that I at one time implemented on Desktop.

The ad position, while receiving 450 clicks, is horrendous in pay. We're talking about 12-13 bucks for that amount. That has to be around 5 cents a click or less.

My question is, did I screw up by using the old code? Should I have created a new code? A few people told me starting off with new Adsense code could have low, low effects until the algorithm figures things out. Others told me old code has a certain level of history and performance, and placing it in a new environment could initially screw it up.

Not sure if I should create a new one to replace that old 300x250 or wait a few days until the algorithm works itself out on the old.

It's so frustrating to see that many clicks and literally pennies being paid. When I had a desktop only, a huge CTR like that would have made me hundreds.

On a sidenote, which ad size earns you the most on your mobile? 300x250 or 300x100?