Black line when using parallax background and slow FPS on good Android devices

Hi,

Im using CCParallaxScrollNode (https://github.com/jasonmarziani/CCParallaxScrollNode) to make scrollbackground.

This is working perfect on my iPhone 3GS with resolution 480/320.

But i set android/iphone/win32 screen to 480/320, but on android it is stretching the image and i think it is the cause of a black line between the two sprites of background parallax, because on correct resolution (480x320) it doenst work.

And on iOS i get 60 FPS but all android devices its rarely go to 60 FPS, always 51 to 58, and i test it on several devices, with dual core, 1ghz.

I have this two problems, can anyone help me?

Android version:
http://www.prsolucoes.com/flyforcoins/flyforcoins-cocos2dx.apk