How would the airlines like it if we instructed "cross Julim at XX, descend at 250 knots"? We'd probably have to throw in a few short vectors every now and then, but you'd all be coming in at the same speed without the problem of running parallel tracks and also the issue where number one is descending at 220 and increasing at Julim with number two coming in at 280 and reducing. As Nautilus has advised, a short vector on 125.2 is far easier than trying to tweak times without encroaching Pearce airspace on 133.9.