The behavior of A(2)C(60) superconductors at the large inter-fulleride separation where the transition temperatures (T-c) are highest is investigated by the synthesis and structural and electronic characterization of face-centered cubic (fcc) A(3)C(60) compounds with the largest lattice parameters yet found. In this family T-c decreases with increasing inter-fulleride separation, despite a continued increase in the density of states at the Fermi level. This contrasts with T-c(a) relationships previously demonstrated for these materials and is consistent with recent suggestions that the interelectron repulsions between carriers in the t(1u) band are important in determining T-c in a fulleride metal near the Mott-Hubbard transition.