WPTouch Adsense block size change

I started using WPTouch 1.9.xx today to convert my blogs into Smartphone compatible. One thing I would like to change in it is Adsense block.

Default is 320×50 as seen in the included file adsense-new.php. I can change it to 300×250, but the ad gets cut off in the mobile view. The space is insufficient. Maybe some sort of tables are used to allocate space for it.

How do I increase the size allocated for ads between Headline and Body? Anyone has experience with it please share.

Cheers!