I have forged pistons - just dont know anything about'em ... I bought the block knowing it had lowered compression and forged pistons.
My experience:
I've blown 2 FPR's because of a shitty adjustable RRFPR which made a wayyy to high fuel pressure in between the FPR and RRFPR ... I opened up the first FPR that I "blew up" - the gasket where wasted. With the result that the fuel return went straight into the vacuum hose instead of the fuel hose, and into the intake plenum, causing a flodding of all 6 cylinders in no time !!
Now I've turned down the pressure as much as possible - and running only 5 psi, I cant hear any knocking so I think I'll be fine for now. I have no o2 sensor, only AFM.
My future plan is to add 2x440cc injectors in my intake - just before the throttle body, and with a Map Fueler system attached, which will engage in several steps upon boost etc. This way, the fuel will get into all 6 cylinders, and I wont loose a piston in case one of the injectors happen to fail. You'll never know. I've heard of several people using this setup, and it works. Its not the best - but it works. The best is of course the right size injectors and some piggy backs.