A common practical use case of CSP in material discovery is to identify candidate new compositions for synthesis. It amounts to approximation of the convex hull by means of individual CSP runs for a wide range of compositions in the phase field . As a measure of potential gain in this context, we aggregate performance improvement across all compositions within the same phase field to demonstrate that our RL implementation with FUSE outperforms the two fixed policies it is compared with, requiring less than 68% and 54% of the steps required by the fixed policies without the additional cost of having to manually tune a fixed policy.