Lo Riders are an OK possible choice. They have a hexagonal core and are wound at a "standard" speed. Fat beams have a round core and are wound at a slower speed which should give them a more flexible feel BUT... I have found (and many other players agree) that the Fat Beams have a more even feeling of string-to-string tension than Lo Riders. What you're looking for is a tight RESPONSE and even tension feel in a S.Steel string. I recommend that you try a set of Fodera Diamond Series Stainless Steel. You can get them in a standard .045 - 105 gauge or a Light Top balanced gauge of .044 - 106. AMAZING response for low-end support, cutting solos and Slap!
Exactly what I noticed as well! Foderas are also round-core and compression-wound like DR's but the core/wrap ratio, wrap structure and wind speed is different. Fodera puts the same level of detail and R&D into their strings as their basses.