I think so as well , I had the Injectors tested , The HPFP Tested and they were with in just a few % of the ST , Figured it was the in tank pump and going to have one tested at 40psi and do the same with a ST to see what they both flow at
I hit 255 hp and the more I push it the sooner in RPM the fuel falls off so sure its in tank pump , Wish SCT would log the fuel psi , I am sure your finding many things you wish SCT did LOL
Tom