[Plugin: WP Super Cache] Problem with iPad caching!

Hi,
I already read this topic: http://wordpress.org/support/topic/plugin-wp-super-cache-different-cache-files-for-different-mobile-devices?replies=9
I tried to follow the thread but I didn’t solve my problem.
I have two plugins, one that serve a theme to iPhone users, and one that serve another theme to iPad users. The problem is that wp super cache show the same cache for both ipad and iPhone themes.
So I can see a page with iPad theme and another page with iPhone theme.
I already added the iPad in the mobile list in wp-cache-config.php in wp-content.
And now, what should I do?

Thanks!