Heavy fermion compounds provide an exceptional playground to explore the intersection of strong electronic correlations and topology [1,2]. A particular forefront of investigation is that of gapless correlated topological phases, exemplified by the discovery of the Weyl-Kondo semimetal (WKSM) state in Ce3Bi4Pd3¬¬ [3-5]. Here we present the synthesis and investigation of Ce3Bi4Ni3¬¬ [6], a new heavy fermion compound with a large hybridization gap compared to that of the prototypical Kondo insulator Ce3Bi4Pt3. We show that this gap as well as other physical properties do not evolve monotonically in the sequence Ce3Bi4Ni3-Ce3Bi4Pd3-Ce3Bi4Pt3, and relate this effect to the results of electronic band structure calculations. [1] S. Paschen & Q. Si, Nat. Rev. Phys. 3, 9 (2021) [2] J. G. Checkelsky, B. A. Bernevig, P. Coleman, Q. Si, and S. Paschen, arXiv:2312.10659 [3] S. Dzsaber et al., Phys. Rev. Lett. 118, 246601 (2017) [4] H.-H. Lai et al., Proc. Natl. Acad. Sci. U.S.A. 115, 93 (2018) [5] S. Dzsaber et al., Proc. Natl. Acad. Sci. U.S.A. 118, e2013386118 (2021) [6] D. M. Kirschbaum et al., arXiv:2311.17903