If he's got a dual filter setup ..he's not using a Dual Guard with two bypass filters. That the setup that uses the itty-bitty hoses.
I'm looking at an ST 3614 and, depending on the wall thickness of the stud, the inlet holes easily fit inside the filter's threaded hole ..with plenty to spare.
In ANY EVENT ..regardless of the "chokes" ...you get ABSOLUTELY NO CHANGE IN FLOW UNLESS THERE IS AN OPENING OF THE OIL PUMP'S RELIEF VALVE (pump losses excluded). It doesn't matter if you have a .0000001" opening ..or 70 weight oil @ -50F through TP filters. That condition must be present for flow reduction.
Naturally any of those conditions would probably open the oil pump's relief valve ..but you've got to understand that one fundamental truth before you can speculate on variations in flow.