The reason traffic destined to 5.5.5.0/24 does not take all of the paths in EIGRP is likely due to the current EIGRP variance setting. EIGRP's variance command allows for unequal cost load balancing by including routes that have a feasible distance up to the specified times the best route's metric. Increasing the variance value will include additional paths that are not currently being utilized because their metrics are higher than the existing variance setting allows. Thus, increasing the variance value will likely resolve the issue by enabling EIGRP to load balance across multiple paths of different metrics.