I need some solid information here, not "I think it is..." Looking for the actual fuel pressure used in the 8.1 truck engines.

I put a set of 8.1 truck injectors in my 6.0. They are rated at 30 lb/hr in the 8.1 engine. I've been told the 8.1 rail operates at 43.5 PSI, so I scaled my injector flow rate in my PCM to reflect my 58 PSI fuel pressure. Problem is my LTRIMs are dumping much more fuel in with the new injectors and programming so I'm wondering if the 8.1 rail is indeed running at 58 PSI and I've told the PCM the injectors are bigger than they actually are...