60 at idle is WAY TOO MUCH. 60 is plenty at hot max. Do you know which pump is on the engine? That pressure would indicate either a hi volume or hi pressure pump. About the only other thing I can think of is a stuck by pass spring. There used to be a tag on the pump if it were either of the hipo ones. If it is the by pass spring, that can be dealt with by simply freeing or replacing the spring. If a hi volume is on there, a change to the standard pump seems prudent.
I usually run the hi volume pump and haven't seen your problem with them. So, I would start with checking out the by pass spring as others have suggested.
15 to 20 pounds of hot idle oil pressure is plenty and again, 60 is plenty at hot max. Any more than that just puts unnecessary wear on the oil pump drive shaft and it's bushing as well as wasting a bit of horsepower. Cold will be somewhat higher, but hot pressure is where the engine spends most of it's time, so it's what we concentrate on.
And by the way, what weight oil are you running? That will also have an impact on your issue. I always used to run a heavy oil. But anymore, with tighter engine tolerances, I don't run 20w50 like I used to. Since I have a preluber, I don't need a multi grade oil. I run Valvoline VR1 30 weight. Many engines would be good with VR1 10w30 as long as their pressure is within the above range. I have just over 20 pounds hot idle and about 65 pounds hot max with a hi volume pump in the Hemi. Been that way for several years now.
