In this work we present 5D GB structureproperty models for FCC Ni and BCC Fe developed using the VFZ framework. We also study correlations in GB energy as a function of crystallographic distance. We use the VFZ framework to give context to GB property correlation lengths and find that previous estimates are likely too high for lownoise, computational GBE calculations while on par when the low-noise constraint is removed. Finally, we investigate general paths through the GB energy landscape and show qualitatively distinct types of relationships between important types of GBs.