Put an old set of ductile iron rockers I have on. Left #1 I and E off (farthest away from the supply hole)to see if it would fill the shaft. Just cranking with the starter it filled the shaft and oil was pouring out of the feed holes for those two rockers..

So I dont think volume is an issue.

I'll put my Dove rockers and shafts back on tomorrow and see if it will pass the test as the old adjustables did.