Sounds exactly like mine did, I was seeing pressures dropping to ~500 psi at high revs / load scenarios, although mine came good again, not sure if the Hypertech tune was the cause of the issue, but when I started logging for the AP trials I had good fuel pressure again, now that I have fitted the hpfp upgrade pump I often see fuel pressure max out over 2000 psi.
I would be very careful driving around on a bad pump, I posted a log from my dashhawk that shows all the key signs of potentially breaking stuff, the car was leaning out pretty bad, even though the ECU was shutting down the boost and throttle plate, it could have gone very pear shaped very quickly, the reason you are hearing the pops in the exhaust is because the ECU is programmed to dump fuel in when pump pressures drop in order to safeguard the engine.
Nearly all men can stand adversity. But if you want to test a man's character - give him power.
Abraham Lincoln