I know this Thread is a bit older but i just saw it now.
On my S4 i'm somehow able to speedhack and search Values without PTrace Error or anything, going above 2x Speed Game gives me Error that Date and Time isn't correct but i can still speedhack it.
I also tried on my Tablet and it gave me XIGNCode3 or something.
I saw something like this on a Game called Final Taptasy too, NoFear wasn't able to hook the App with his Moto X (?) as it gave him PTrace Error.
I tried it it worked fine on my Device, Nofear asked me which device i am using and then i said S4.
He tried it on his S4 and everything worked for him too.
What is so diffrent about S4 that Games can't defend it?