I would not restrict the oil if it's NOT PR oiling. If it's factory Chrysler like you say, it is self adjusting...backwards.
As RPM goes up, oil to the shafts goes down.
If oil is backing up in the heads you need to address drain back issues, unless someone made it so you get full time oil to the heads, like a wide, deep, groove in the cam around the number 2 and 4 cam bearings. I only do that over 7500 RPM or so, depending on application.
Whose rockers and shafts?
EDIT: I see they are comp rockers. Haven't seen any in a while. Do they have two bushings in each rocker with a gap in the middle? If so, that lets oil to the rocker full time. I think it's stupid. I may be dealing with it on some PRW rockers I am using. If I have too much oil, the rockers will go to Rocker Arm Specialists for a full width bushing and I will drill the correct oil holes in the bushing and shaft.
The Chrysler system is fool proof if you understand it. If you don't, you do stupid things like split bushings.
