my 550's are maxed out at 18 psi

[94talonawd]

OK. Heres the story. I had recently put some allegedly PTE 550cc injectors and SAFC in my car. For some reason my injectors are maxed out past 100% at 18psi on my datalogger. I then turned my boost down to 12 psi, put all the corrections back to 0%, and then logged it on 3rd gear. I am getting around 2-3 counts of knock under 6k and about 10-15 counts of knock over 6k. My injectors are at around 88%-90%. Before when i had my 450's I can go to 15 psi with no counts of knock. Something is wrong here.

Now the question is...
Are the injector really 550's, or did I get ripped off? My broter had bought it a while ago for his 3S. He got it off of the 3/s forums.