Question [Q] Change Google Playstore Region Setting

Hello Guys,

i bought the International Version of the HTC One in Hong Kong and using it with S-On, Viper 4.1 Rom and Bulletproof Kernel.
I live in China and using China Unicom Provider.

My Problem is, that the Playstore only shows the chinese regional Apps (which is normal) and only the free ones (i dont know if this is normal).
I added my german credit card and billing address to google wallet as some tutorials suggest but it doesnt change anything.
I did delete APP Data and Cache several times, downgraded to a older Playstore Version but nothing helps.

Has somebody any idea how i can change my Playstore Region to Germany or USA and also make it to show apps you have to pay for?

Thanks in advance!