I am coming very, very late to this conversation, so, sorry for that. Maybe I can shed a bit of ligh on the discussion, though.
the windward sheeting traveler looks great. I am jealous and would love to have one. But I still have a stock or slightly modified factory E33 RH setup. It is helpful to look at the excellent Harken diagrams of various travelers to get more understanding of the system, too. See this link:
Traveler controls must be powerful enough to move the car easily under load and lead
www.harken.com
scroll down to 3:1 Remote cleat. That is basically the design of the stock, factory system, although they used Schaeffer hardware. The lines are led slightly differently from your setup, though Kevin. The two ends are not separated but port and starboard are actually one continuous line which loops back to the opposite side and merely hangs below the traveler in the cockpit. This is good to have IMHO. This system, overall, does not lend itself well to short handed sailing and is certainly NOT good for single handing.
So, the Harken illustration describes the purpose of the remote cleat, “when the crew sits above the traveler, lead control lines up the cockpit sides to a convenient location on the coaming.” So that design was intended for crew to control the traveler and by using the single, continuous traveler line, crew perched on the upwind coaming could flick the line upward to release it from the opposite, leeward side jamb cleat, and could then pull the traveler up to windward. In theory, at least. However 3:1 is much too little purchase to do that with the big main, though. I modified mine to add purchase.....4:1 or is it 5:1. It’s quite a bit better at pulling the traveler “uphill,” but it is not near as good as your windward sheet system, I am sure!
Now look back at the Harken diagrams and scroll up to the windward sheet traveler. It is a self contained system and the end cleats are included. Therefore, by leading your lines up through the old factory remote cleats, you are defeating and negating some of the functionality of the windward sheeting system. I am not sure if that is being done on your system because the photo doesn’t quite stretch that far out. It might be wise for you to consult with the excellent Harken support staff about your system to determine if it is indeed set up right.