Perovskite solar cells (PSCs) have reached power conversion efficiencies (PCEs) above 25%, but the intrinsic instability of perovskite absorbers remains a hurdle to practical deployment. Hole-transport layer (HTL) engineering is an effective route to improve efficiency and stability. Although Spiro-OMeTAD is widely used in high-performance PSCs, its strong dependence on dopant additives and moisture sensitivity can accelerate degradation and reduce operational stability. In this study, we optimize n–i–p PSCs by replacing Spiro-OMeTAD with an alternative polymeric HTL and employing p-doping to enhance hole extraction/transport and suppress interfacial recombination. Device performance is evaluated as a function of HTL replacement and doping conditions, together with humidity- and operation-related stability tests. The results indicate that HTL replacement/engineering provides a viable pathway toward high-performance, more stable FAPbI₃ PSCs.