Inductive ovens are integral to electron cyclotron resonance (ECR) ion sources, facilitating the generation of high-intensity solid ion beams. At the Facility for Rare Isotope Beams (FRIB), specialized inductive High Temperature Oven (HTO) has been developed to ensure the reliable production of solid ion beams for the High-Power ECR (HPECR) ion source. These HTOs have successfully supported the operation of various solid ion beams, including Silicon, Nickel, and Uranium. In alignment with the FRIB beam power ramp-up objectives, future requirements include increased beam currents and prolonged operational durations for heavier species. To optimize HTO performance in response to these evolving demands, a series of design improvements have been implemented, drawing on insights from previous operational experience. These improvements are intended to enhance both operational stability and beam consistency. The detailed improved design, Ansys® simulation results, and testing results will be presented and discussed.