Fuel Pressure Regulator

Although my build is NA, I thought some of you FI guys might be the most knowledgable ones to ask about FPRs. My build is a 96 with a 2000 engine, so it is a return-type fuel system. I have been running the 96 fuel rail with the stock FPR and 96 injectors. I'm switching to a M-Tuned fuel rail, stock 2000 injectors (310 cc/min @ 65 psi), a M-Tuned adjustable FPR, and a Walbro HP pump. Basically, my goal is to have the fuel system supply 65-70 psi in order to take advantage of the better spray pattern and delivery capacity of the NB injectors. So here's my question: Somewhere I read that it is preferable to still use the stock FPR along with the adjustable FPR in order to help keep a steady 45psi at idle and lower rpms and set the adjustable FPR to deliver the 65-70 psi at upper rpms. Anybody know if this makes sense? Doesn't the stock NB fuel system maintain 60-65 psi all the time? I'm hoping I don't need the stock FPR at all, because it won't fit on the new fuel rail, anyway. Is there any problem with using the M-tuned FPR in full control of the pressure? TIA.