I don't think double feeding the right galley is going to beneficial in terms of slowing the oil down...I think the benefit is anytime you pressure up a circuit in a loop rather than from one end you gain all sorts of pressure drop and distribution benefits.
And distribution is exactly the problem. You can debate which way is the best way, the yellow rose post is radically redistributed but he claims it works and I have seen old fueled engines of the past that oiled that way through the caps.
IMHO the r3 block was cast with no oil to lifters because Chrysler is confident in that recommendation. I usually tube my blocks as well but I too have gone with a .030 oil hole, but not for pushrod oiling, but for bushed lifter axle oiling. I am oiling my rockers the usual way but the feed is now taken from the main galley instead of the cam bearings.
