Sorry, no. I've never driven one with Rancho's. All I know is that the OME were the perfect choice for me. Stiff enough to handle the 33x12.50's without breaking a sweat & comfortable ride quality. I think they were designed specifically by OME for Troopers with lift & large tires. The setup I replaced was OEM front & Rancho's on the rear ... & all 4 corners needed replacing.
and one more thing it seems the OME springs and the 913's are the same height so because they seem thicker are the 913's just stiffer? ::
Sorry, can't say. I'm running CalMini springs (which I do not recommend). They appear to be sagging. Eventually I'll be changing over to 913's but it'll hafta wait till I can squirrel away enough for HD torsion bars & drag links at the same time.