I've heard or read claims from people both ways, some saying the S&S pump fixed the problem and others saying it did not. I'm not aware of any independent scientifically valid studies that prove anything, one way or the other. Last time I checked I hadn't seen any indication that Harley has ever admitted what the root cause of the problem actually is, so all we have is speculation from people who want to sell you parts. I'm personally of the opinion that the problem is related to the redesigned for the M8 engine cases and oil return system, and all the oil pump changes by Harley are just their attempt to find a cheaper band-aid fix versus a root cause fix. But that is also something I haven't seen actually proved or disproved.
In the course of the 5k miles you put on the bike so far, have you actually experienced any symptoms of "sumping", such as loss of power and overheating?
JMHO - Jerry